WO2004056886A1 - Biodegradable polymers - Google Patents

Biodegradable polymers Download PDF

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Publication number
WO2004056886A1
WO2004056886A1 PCT/GB2003/005570 GB0305570W WO2004056886A1 WO 2004056886 A1 WO2004056886 A1 WO 2004056886A1 GB 0305570 W GB0305570 W GB 0305570W WO 2004056886 A1 WO2004056886 A1 WO 2004056886A1
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WIPO (PCT)
Prior art keywords
acid
polymer
chain
transfer agent
polymer according
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Application number
PCT/GB2003/005570
Other languages
French (fr)
Inventor
Gary Woodward
Graham Philip Otter
Keith Philip Davis
Kim Huan
Original Assignee
Rhodia Consumer Specialties Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rhodia Consumer Specialties Limited filed Critical Rhodia Consumer Specialties Limited
Priority to US10/539,436 priority Critical patent/US7879964B2/en
Priority to AT03786137T priority patent/ATE432299T1/en
Priority to AU2003295136A priority patent/AU2003295136A1/en
Priority to DK03786137T priority patent/DK1578818T3/en
Priority to DE60327808T priority patent/DE60327808D1/en
Priority to EP03786137A priority patent/EP1578818B1/en
Priority to CA2510749A priority patent/CA2510749C/en
Publication of WO2004056886A1 publication Critical patent/WO2004056886A1/en
Priority to NO20053451A priority patent/NO333580B1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/04—Acids, Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F30/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
    • C08F30/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus

Definitions

  • This invention relates to biodegradable polymers, especially phosphorus- containing polymers which meet or exceed the minimum statutory requirements for biodegradability. This invention also relates to a method of making such polymers and to their use as scale-inhibitors in oilfield applications.
  • Polymers having phosphorus-containing end-caps are widely used as scale-inhibitors, particularly in oilfield applications. Examples of such polymers are disclosed in the applicant's EP-A-0 861 846, the contents of which are incorporated herein by reference.
  • the present invention provides, in a first aspect, a phosphorus-containing polymer comprising the reaction product of an unsaturated phosphonic acid with a chain-transfer agent, the polymer having improved biodegradability as compared to the same polymer when made in the absence of the chain-transfer agent.
  • the polymer has a biodegradability of at least 20% per 28 days (as determined by OECD 306) .
  • the chain-transfer agent may be, for example,
  • a phosphorus-containing polymer comprising the reaction product of a chain-transfer agent having at least one P-H bond with an unsaturated carboxylic, phosphonic or sulphonic acid, the polymer having a biodegradability of at least 20% per 28 days (as determined by OECD 306).
  • polymers which include phosphorus-containing end-caps can have a desirably high biodegradability as well as being effective as oilfield scale inhibitors.
  • a polymer having phosphorus-containing end- caps comprising the reaction product of a chain-transfer agent having at least one P-H bond with an unsaturated carboxylic, phosphonic or sulphonic acid, said polymer having a biodegradability of at least 20% per 28 days (as determined by OECD 306).
  • the chain-transfer agent having at least one P-H bond is hypophosphorous acid or a water-soluble salt (such as an alkali metal salt or ammonium salt) of said acid.
  • a water-soluble salt such as an alkali metal salt or ammonium salt
  • the unsaturated carboxylic acid is acrylic acid or a water- soluble salt of said acid.
  • the unsaturated carboxylic acid may be, for example, methacrylic acid, maleic acid, fumaric acid, itaconic acid, aconitic acid, citraconic acid, mesaconic acid, crotonic acid, isocrotonic acid, angelic acid or tiglic acid (or a water-soluble salt of any of said acids).
  • the unsaturated phosphonic acid is vinylphosphonic acid (VPA) or vinylidene-l ,l-diphosphonic acid (NDPA) or a water-soluble salt of either of said acids.
  • the unsaturated sulphonic acid is vinylsulphonic acid (VSA) or a water-soluble salt of said acid.
  • the polymer comprises a telomer which is the reaction product of an adduct of vinylphosphonic acid and hypophosphorous acid (hereinafter referred to as "PPE-endcapper”) with acrylic acid, said telomer being hereinafter referred to as a “PPE-endcapped polyacrylate” .
  • the ratio of the PPE-endcapper to acrylic acid is suitably in the range 1:5 to 1:20 molar and preferably about 1:10 molar.
  • the polymers according to the present invention exhibit a weight average molecular weight such that at least 20% by weight of the polymer has a weight average molecular weight of 1000 or lower. More preferably, at least 35% by weight of the polymer has a weight average molecular weight of 1000 or lower.
  • the present invention provides a method of making a polymer according to the first aspect of the present invention, in which the chain-transfer agent and the unsaturated acid are reacted together in the presence of a free-radical initiator.
  • the free-radical initiator is preferably an alkali metal persulphate (especially sodium persulphate).
  • the free-radical initiator may be an alkali metal peracetate, hydrogen peroxide, a hydroperoxide, chlorine dioxide, an alkali metal chlorate or hypochlorite, an organometallic hydride, an azo-compound (e.g. 4,4'-azo-bis-cyanovaleric acid), electrolysis, ultraviolet or other ionising radiation, ultrasound, or any combination of the foregoing.
  • the present invention provides, in a third aspect, a polymer made by the method disclosed in the three immediately-preceding paragraphs.
  • the present invention provides the use, as a scale- inhibitor for oilfield applications, of a polymer according to the first or third aspects of the present invention.
  • a PPE-endcapped polyacrylate (Ref. KH59, ratio of PPP-endcapper to acrylic acid 1 : 10 molar) was prepared as follows:
  • the endcapper consisted essentially of trisodium l-phosphono-2- phosphino ethane, prepared according to the disclosure in the applicants' EP-A-0 861 846.
  • PPE-endcapped polyacrylate (Ref. KH70, ratio of PPE endcapper to acrylic acid 1:10 molar) was prepared by the method of Example 1 (above), except that in the preparation of Feed 2, the acrylic acid was fully neutralised with the sodium hydroxide solution, so that the reaction was carried out at pH7 instead of pH4.
  • Example 1 and Example 2 were subjected to the Tube Block Test described in our published application WO 01/57050, Example 3, and to the Biodegradability Test (OECD 306). The results are set out in TABLE B (below) . In each case, a PPE-endcapped polyacrylate in which the PPE endcapper was trisodium l-phosphono-2-phosphino-ethane was used. TABLE B

Abstract

A phosphorus-containing polymer is provided comprising the reaction product of a chain-transfer agent having at least one pH bond with an unsaturated carboxylic, phosphonic or sulphonic acid. The invention also provides the aforementioned phosphorus-containing polymer further comprising phosphorus-containing end-caps. The polymers have a biodegradability of at least 20% per 28 days (as determined by OECD 306).

Description

BIODEGRADABLE POLYMERS
This invention relates to biodegradable polymers, especially phosphorus- containing polymers which meet or exceed the minimum statutory requirements for biodegradability. This invention also relates to a method of making such polymers and to their use as scale-inhibitors in oilfield applications.
There is a need for more environmentally benign chemicals to be used in the extraction of petroleum from subsea reservoirs, such as those located in the North Sea. Chemicals that may ultimately be discharged to the marine environment must have low toxicity towards marine organisms and should not exhibit a tendency to build up in their tissues (bio-accumulate) . It is also desirable that a product does not accumulate in the environment, but can be degraded chemically or by the action of micro-organisms (biodegradation) . Thus, the authorities who regulate the use of chemicals in the North Sea stipulate a threshold of at least 20% biodegradation in 28 days (OECD 306) as part of the "pre-screening" test for the 'CHARM' model, which is currently used to assess environmental impact.
Polymers having phosphorus-containing end-caps, especially polymers comprising acrylic acid, are widely used as scale-inhibitors, particularly in oilfield applications. Examples of such polymers are disclosed in the applicant's EP-A-0 861 846, the contents of which are incorporated herein by reference.
It is known that the biodegradability of acrylic acid-containing polymers, which are generally poorly biodegraded, is greatly improved by reducing the weight average molecular weight (Mw) below 700 Daltons. See, for example, J. Environ. Polym.Degrad., 1997, 5, p41-48. It was suggested that one possible means of producing polymers with Mw in this region might be afforded by the use of the lower oxo acids of phosphorus (III) and their salts as chain-transfer agents, but it was by no means certain that the resulting polymers would be as biodegradable as the corresponding phosphorus-free polyacrylates. Such polymers are being increasingly utilised as scale inhibitors during the secondary recovery of oil from reservoirs with very demanding water chemistry and conditions, so it is important that low molecular weight modifications retain this functionality. The effect of reducing molecular weight on scale inhibitor performance is again not predictable: for simple polycarboxylates there is often an optimum range of molecular weight, either side of which performance often falls off markedly.
The present invention provides, in a first aspect, a phosphorus-containing polymer comprising the reaction product of an unsaturated phosphonic acid with a chain-transfer agent, the polymer having improved biodegradability as compared to the same polymer when made in the absence of the chain-transfer agent.
Preferably, the polymer has a biodegradability of at least 20% per 28 days (as determined by OECD 306) .
The chain-transfer agent may be, for example,
(a) benzene, toluene, ethylbenzene or chlorobenzene;
(b) methylene chloride, ethylene chloride, chloroform or carbon tetrachloride;
(c) acetone, thiophenol, n-butyl thiol or dodecyl thiol.
We have found that by the use of chain-transfer agents containing at least one 'P-H' bond, it is possible to produce polymers which combine excellent activity as oilfield scale inhibitors with good biodegradability, often in excess of that required by 'OECD 306' . In a first preferred embodiment of the first aspect of the present invention, there is provided a phosphorus-containing polymer comprising the reaction product of a chain-transfer agent having at least one P-H bond with an unsaturated carboxylic, phosphonic or sulphonic acid, the polymer having a biodegradability of at least 20% per 28 days (as determined by OECD 306).
We have also found that polymers which include phosphorus-containing end-caps can have a desirably high biodegradability as well as being effective as oilfield scale inhibitors.
Thus, in a second preferred embodiment of the first aspect of the present invention, there is provided a polymer having phosphorus-containing end- caps and comprising the reaction product of a chain-transfer agent having at least one P-H bond with an unsaturated carboxylic, phosphonic or sulphonic acid, said polymer having a biodegradability of at least 20% per 28 days (as determined by OECD 306).
Preferably, the chain-transfer agent having at least one P-H bond is hypophosphorous acid or a water-soluble salt (such as an alkali metal salt or ammonium salt) of said acid.
Preferably, the unsaturated carboxylic acid is acrylic acid or a water- soluble salt of said acid.
Alternatively, the unsaturated carboxylic acid may be, for example, methacrylic acid, maleic acid, fumaric acid, itaconic acid, aconitic acid, citraconic acid, mesaconic acid, crotonic acid, isocrotonic acid, angelic acid or tiglic acid (or a water-soluble salt of any of said acids). Suitably, the unsaturated phosphonic acid is vinylphosphonic acid (VPA) or vinylidene-l ,l-diphosphonic acid (NDPA) or a water-soluble salt of either of said acids.
Preferably, the unsaturated sulphonic acid is vinylsulphonic acid (VSA) or a water-soluble salt of said acid.
In a third preferred embodiment of the first aspect of the present invention, the polymer comprises a telomer which is the reaction product of an adduct of vinylphosphonic acid and hypophosphorous acid (hereinafter referred to as "PPE-endcapper") with acrylic acid, said telomer being hereinafter referred to as a "PPE-endcapped polyacrylate" .
The ratio of the PPE-endcapper to acrylic acid is suitably in the range 1:5 to 1:20 molar and preferably about 1:10 molar.
Preferably, the polymers according to the present invention exhibit a weight average molecular weight such that at least 20% by weight of the polymer has a weight average molecular weight of 1000 or lower. More preferably, at least 35% by weight of the polymer has a weight average molecular weight of 1000 or lower.
In a second aspect, the present invention provides a method of making a polymer according to the first aspect of the present invention, in which the chain-transfer agent and the unsaturated acid are reacted together in the presence of a free-radical initiator.
The free-radical initiator is preferably an alkali metal persulphate (especially sodium persulphate). Alternatively, the free-radical initiator may be an alkali metal peracetate, hydrogen peroxide, a hydroperoxide, chlorine dioxide, an alkali metal chlorate or hypochlorite, an organometallic hydride, an azo-compound (e.g. 4,4'-azo-bis-cyanovaleric acid), electrolysis, ultraviolet or other ionising radiation, ultrasound, or any combination of the foregoing.
The present invention provides, in a third aspect, a polymer made by the method disclosed in the three immediately-preceding paragraphs.
In a fourth aspect, the present invention provides the use, as a scale- inhibitor for oilfield applications, of a polymer according to the first or third aspects of the present invention.
Preferred embodiments of the present invention will be illustrated by way of the following Examples.
Example 1
A PPE-endcapped polyacrylate (Ref. KH59, ratio of PPP-endcapper to acrylic acid 1 : 10 molar) was prepared as follows:
The reagents shown in TABLE A (below) were taken
TABLE A
Figure imgf000007_0001
*The endcapper consisted essentially of trisodium l-phosphono-2- phosphino ethane, prepared according to the disclosure in the applicants' EP-A-0 861 846.
Half of the PPE endcapper (140 g, 0.1 mol) was charged to a 1-litre jacketed reactor, stirred and heated to 95 °C.
Meanwhile, three feeds were prepared:
Feed (1) An initiator solution of sodium persulphate (23.8 g, 0.1 mol) and water (177.4 g);
Feed (2) Acrylic acid (144 g, 1.99 mol) was diluted with ice (200 g) and water (286 g) . The pH was adjusted to 4 by addition of the sodium hydroxide solution (60 g of 46-48% solids, 0.71 mol) . Half of this total solution (690 g x Vz = 345 g) was added to the other half of the PPE endcapper (140 g, 0.10 mol) to give 485 g of Feed 2;
Feed (3) The remaining acrylate solution (345 g) .
Once the reaction temperature had been reached, Feeds 1 and 2 were simultaneously started by means of separate peristatic pumps. Feed 1 was added over 8 hours and Feed 2 was added in at a steady rate over 4 hours. On completion of Feed 2, Feed 3 was added over 3V2 hours. Therefore, the initiator Feed (1) runs for Vz hour longer than Feed 3. When all feeds had finished, the reaction was kept at reflux for a further hour, then allowed to cool (total reaction time = 8 έ hours) .
At this stage the product was at a concentration of 16.3% w/w actives. To achieve the desired concentration of 25% w/w actives (32.6% w/w solids), water (403 g) was removed by rotary evaporation. (Concentrations based on 100% yield).
Example 2
Another PPE-endcapped polyacrylate (Ref. KH70, ratio of PPE endcapper to acrylic acid 1:10 molar) was prepared by the method of Example 1 (above), except that in the preparation of Feed 2, the acrylic acid was fully neutralised with the sodium hydroxide solution, so that the reaction was carried out at pH7 instead of pH4.
Performance and Biodegradability Tests
The products of Example 1 and Example 2 (above), together with two comparative products, were subjected to the Tube Block Test described in our published application WO 01/57050, Example 3, and to the Biodegradability Test (OECD 306). The results are set out in TABLE B (below) . In each case, a PPE-endcapped polyacrylate in which the PPE endcapper was trisodium l-phosphono-2-phosphino-ethane was used. TABLE B
Figure imgf000009_0001
It will be seen that the products of Examples 1 and 2 of the present invention each satisfied the conditions of OECD 306.

Claims

1. A phosphorus-containing polymer, comprising the reaction product of an unsaturated phosphonic acid with a chain-transfer agent, the polymer having improved biodegradability as compared to the same polymer when made in the absence of the chain-transfer agent.
2. A polymer according to Claim 1 , the polymer having a biodegradability of at least 20% per 28 days (as determined by OECD 306) .
3. A polymer according to Claim 1, in which the chain-transfer agent is benzene, toluene, ethylbenzene or chlorobenzene.
4. A polymer according to Claim 1, in which the chain-transfer agent is methylene chloride, ethylene chloride, chloroform or carbon tetrachloride.
5. A polymer according to Claim 1, in which the chain-transfer agent is acetone, thiophenol, n- butyl thiol or dodecyl thiol.
6. A phosphorus-containing polymer comprising the reaction product of a chain-transfer agent having at least one P-H bond with an unsaturated carboxylic, phosphonic or sulphonic acid, the polymer having a biodegradability of at least 20% per 28 days (as determined by OECD 306).
7. A polymer according to Claim 6, having phosphorus-containing end-caps and comprising the reaction product of a chain-transfer agent having at least one P-H bond with an unsaturated carboxylic, phosphonic or sulphonic acid, said polymer having a biodegradability of at least 20% per 28 days (as determined by OECD 306) .
8. A polymer according to Claim 6 or 7, in which the chain-transfer agent having at least one P-H bond is hypophosphorous acid or a water- soluble salt of said acid.
9. A polymer according to Claim 8, in which the chain-transfer agent is an alkali metal salt or an ammonium salt of hypophosphorous acid.
10. A polymer according to any one of Claims 6 to 9, in which the unsaturated carboxylic acid is acrylic acid or a water-soluble salt of said acid.
11. A polymer according to any one of Claims 6 to 9, in which the unsaturated carboxylic acid is methacrylic acid, maleic acid, fumaric acid, itaconic acid, aconitic acid, citraconic acid, mesaconic acid, crotonic acid, isocrotonic acid, angelic acid, tiglic acid or a water-soluble salt of any of said acids.
12. A polymer according to Claim 1 or to any one of Claims 6 to 9, in which the unsaturated phosphonic acid is vinylphosphonic acid (VPA) , vinylidene-l , l-diphosphonic acid (VDPA) or a water-soluble salt of either of said acids.
13. A polymer according to any one of Claims 6 to 9, in which the unsaturated sulphonic acid is vinylsulphonic acid (VSA) or a water- soluble salt of said acid.
14. A polymer according to any one of Claims 1 to 10, comprising a telomer which is the reaction product of a PPE-endcapper (as hereinbefore defined) with acrylic acid.
15. A polymer according to Claim 14, in which the ratio of the PPE- endcapper to acrylic acid is in the range 1:5 to 1:20 molar.
16. A polymer according to Claim 14 or 15, in which the ratio of the PPE-endcapper to acrylic acid is about 1 :10 molar.
17. A polymer according to any one of Claims 1 to 16, in which at least 20% by weight of the polymer has a weight average molecular weight of 1000 or lower.
18. A polymer according to Claim 17, in which at least 35% by weight of the polymer has a weight average molecular weight of 1000 or lower.
19. A method of making a polymer according to any one of Claims 1 to 18, in which the chain-transfer agent and the unsaturated acid are reacted together in the presence of a free-radical initiator.
20. A method according to Claim 19, in which the free-radical initiator is an alkali metal persulphate.
21. A method according to Claim 20, in which the free-radical initiator is sodium persulphate.
22. A method according to Claim 19, in which the free-radical initiator is an alkali metal peracetate, hydrogen peroxide, a hydroperoxide, chlorine dioxide, an alkali metal chlorate or hypochlorite, an organometallic hydride, an azo-compound or any two or more of the foregoing.
23. A method according to Claim 22, in which the free-radical initiator is 4,4'-azo-bis-cyanovaleric acid.
24. A method according to Claim 19, in which the free-radical initiator comprises electrolysis, ultraviolet or other ionising radiation, ultrasound or any two or more of the foregoing.
25. A method of making a biodegradable polymer, substantially as hereinbefore described with reference to the Examples.
26. A phosphorus-containing polymer comprising the reaction product of a chain transfer agent with an unsaturated carboxylic, phosphonic or sulphonic acid, the polymer having improved biodegradability as compared to the same polymer when made in the absence of the chain- transfer agent.
27. A phosphorus-containing polymer as claimed in Claim 25 having phosphorus-containing end caps.
28. A biodegradable polymer as claimed in Claims 1 to 18, 26 and 27 made by the method of any one of Claims 19 to 25.
29. The use of a biodegradable polymer according to any one of Claims 1 to 18, 26 and 27 as a scale-inhibitor for oilfield applications.
PCT/GB2003/005570 2002-12-20 2003-12-19 Biodegradable polymers WO2004056886A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US10/539,436 US7879964B2 (en) 2002-12-20 2003-12-19 Biodegradable polymers
AT03786137T ATE432299T1 (en) 2002-12-20 2003-12-19 BIODEGRADABLE POLYMERS
AU2003295136A AU2003295136A1 (en) 2002-12-20 2003-12-19 Biodegradable polymers
DK03786137T DK1578818T3 (en) 2002-12-20 2003-12-19 Biodegradable polymers
DE60327808T DE60327808D1 (en) 2002-12-20 2003-12-19 BIODEGRADABLE POLYMERS
EP03786137A EP1578818B1 (en) 2002-12-20 2003-12-19 Biodegradable polymers
CA2510749A CA2510749C (en) 2002-12-20 2003-12-19 Biodegradable polymers
NO20053451A NO333580B1 (en) 2002-12-20 2005-07-15 Biodegradable polymers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0229684.6A GB0229684D0 (en) 2002-12-20 2002-12-20 Biodegradable polymers
GB0229684.6 2002-12-20

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US (1) US7879964B2 (en)
EP (1) EP1578818B1 (en)
AT (1) ATE432299T1 (en)
AU (1) AU2003295136A1 (en)
CA (1) CA2510749C (en)
DE (1) DE60327808D1 (en)
DK (1) DK1578818T3 (en)
ES (1) ES2324032T3 (en)
GB (1) GB0229684D0 (en)
NO (1) NO333580B1 (en)
WO (1) WO2004056886A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP2628894A1 (en) 2006-09-05 2013-08-21 University Of Kansas Polyelectrolyte complexes for oil and gas applications

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Publication number Priority date Publication date Assignee Title
EP2650314A1 (en) * 2012-04-13 2013-10-16 Clariant International Ltd. Process for inhibition of sulphide scales

Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0405818A2 (en) * 1989-06-26 1991-01-02 Rohm And Haas Company Low molecular weight, water-soluble phosphinate and phosphonate-containing polymers, and their preparation
EP0861846A2 (en) * 1997-02-26 1998-09-02 ALBRIGHT & WILSON UK LIMITED Novel phosphino derivatives

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US5216099A (en) 1989-06-26 1993-06-01 Rohm And Haas Company Low molecular weight water soluble phosphinate and phosphonate containing polymers
US5256746A (en) 1991-04-25 1993-10-26 Rohm And Haas Company Low molecular weight monoalkyl substituted phosphinate and phosphonate copolymers
AU728096B2 (en) 1996-03-01 2001-01-04 Rohm And Haas Company Process for preparing phosphonate-terminated polymers
US5866664A (en) 1997-02-03 1999-02-02 Rohm And Haas Company Process for preparing phosphonate-terminated polymers
JP2000198809A (en) 1998-12-29 2000-07-18 Sanyo Chem Ind Ltd Production of alfa, beta-unsaturated carboxylic acid or its salt (co)polymer
US6624273B1 (en) * 1999-03-19 2003-09-23 3M Innovative Properties Company Plasticized acrylics for pressure sensitive adhesive applications

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0405818A2 (en) * 1989-06-26 1991-01-02 Rohm And Haas Company Low molecular weight, water-soluble phosphinate and phosphonate-containing polymers, and their preparation
EP0861846A2 (en) * 1997-02-26 1998-09-02 ALBRIGHT & WILSON UK LIMITED Novel phosphino derivatives

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2628894A1 (en) 2006-09-05 2013-08-21 University Of Kansas Polyelectrolyte complexes for oil and gas applications

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AU2003295136A1 (en) 2004-07-14
DK1578818T3 (en) 2009-08-17
CA2510749C (en) 2012-04-24
ES2324032T3 (en) 2009-07-29
US20070282086A1 (en) 2007-12-06
NO333580B1 (en) 2013-07-15
NO20053451D0 (en) 2005-07-15
ATE432299T1 (en) 2009-06-15
EP1578818A1 (en) 2005-09-28
GB0229684D0 (en) 2003-01-29
US7879964B2 (en) 2011-02-01
DE60327808D1 (en) 2009-07-09
CA2510749A1 (en) 2004-07-08
EP1578818B1 (en) 2009-05-27
NO20053451L (en) 2005-09-20

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