Classifications

• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
  • A63C5/00—Skis or snowboards
  • A63C5/04—Structure of the surface thereof
  • A63C5/044—Structure of the surface thereof of the running sole
• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
  • A63C5/00—Skis or snowboards
  • A63C5/04—Structure of the surface thereof
  • A63C5/056—Materials for the running sole
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31725—Of polyamide

Definitions

• the present invention relates to a ski sole, that is to say the lower part of the ski in contact with the snow and on which the ski and the skier rests.
• the ski sole according to the invention has an excellent ability to absorb waxes and retain them durably.
• the ski soles are generally in the form of a sheet or a film with a thickness of between 0.5 and 2 mm. They are made of polyolefinic plastic and preferably based on high density polyethylene (HDPE), and / or high molecular weight (number average molecular weight between 150,000 and 450,000) which can be measured by gel permeation chromatography. .
• HDPE high density polyethylene
• high molecular weight number average molecular weight between 150,000 and 450,000
• HDPE of very high molecular weight (number average molecular weight of between 300,000 and 8,000,000) is also used to manufacture high competition ski soles. These soles are obtained by sintering, a much more expensive technique than extrusion.
• the ski sole, object of the present invention comprises a sheet or film of thermoplastic polymer material based on an intimate mixture of one or more polyolefins and one or more polyetheresteramides.
• the properties that such a ski sole has are, in particular: - an excellent ability to absorb waxes and retain them in a sustainable way, - a very good slip due to a low coefficient of friction, - good resistance to impact and abrasion, - good bonding ability on the draft of the ski, - a particularly good dye affinity as well as antistatic properties at low temperature, - a transparency or translucency such that one can quite clearly distinguish the draft of the ski through the sole possibly coated with various inscriptions such as drawings, marks ...
• the ski sole according to the invention consists of a thermoplastic polymer material based on one or more polyolefins and one or more polyetheresteramides, and which may contain various additives, fillers, etc.
• polyetheresteramides is intended to mean both the random polyetheresteramides (that is to say formed by the random sequence of the various monomer components) and the block polyetheresteramides, that is to say formed from blocks having a certain length of chain. their various constituents.
• Polyetheresteramides are the product of the copolycondensation of polyamide blocks with reactive ends with polyether blocks with reactive ends, such as, inter alia: . polyamide sequences for dicarboxylic chain ends with polyetherdiol sequences.
• the number-average molecular mass of these polyamide blocks is generally between 500 and 10,000 and more particularly between 600 and 5,000.
• the polyamide blocks of the polyetheresteramides are preferably formed from polyamide 6, 6.6, 6.12, 11 or 12 (PA- 6, PA-6.6, PA-6.12, PA-11, PA-12) or of copolyamides resulting from the polycondensation of their monomers.
• the number average molecular weight of the polyethers is generally between 200 and 6000 and more particularly between 600 and 3000.
• the polyether blocks preferably consist of polytetramethylene glycol (PTMG), polypropylene glycol (PPG), or polyethylene glycol (PEG).
• PTMG polytetramethylene glycol
• PPG polypropylene glycol
• PEG polyethylene glycol
• the inherent viscosity of polyetheresteramides is advantageously between 0.8 and 2.05.
• the inherent viscosity is measured in metacresol at 20 ° C with an initial concentration of 0.5 g per 100 g of metacresol. It is expressed in dlg ⁇ 1.
• the polyetheresteramides according to the invention can be formed from 5 to 85% by weight of polyether, and from 95 to 15% by weight of polyamide, and preferably from 30 to 80% by weight of polyether and from 70 to 20% by weight polyamide.
• the polyolefin (s) used for the ski sole, object of the present invention consist of polypropylene (PP), polyethylene (PE), their mixtures or copolymers, but is preferably polyethylene.
• the polyolefin (s) are of high molecular weight.
• the number average molecular weight of the preferred polyolefins can be between 100,000 and 500,000, and preferably between 150,000 and 400,000.
• the mixture of thermoplastic polymer material constituting the ski sole of the invention may contain from 50 to 99% by weight of polyolefin (s) and from 50 to 1% by weight of polyetheresteramide (s) and preferably it contains from 60 90% by weight of polyolefin (s) and 40 to 10% of polyetheresteramide (s).
• the mixture may optionally contain, for example, up to 70% of organic or inorganic, fibrous or pulverulent fillers.
• fillers examples include silica, titanium oxide, glass fibers, carbon fibers.
• the mixture can also contain various additives such as anti-UV agents, release agents, impact modifiers, waxes ...
• an emulsifying agent it is possible to choose, for example, maleized polypropylene.
• emulsifier In general, 1 to 5% by weight of emulsifier is incorporated into the mixture.
• the presence of an emulsifying agent is not necessary. However, it is particularly recommended when the proportion of polyetheresteramide in the mixture is greater than or equal to 20% by weight.
• the manufacture of the ski soles according to the invention and in particular the shaping of a sheet or film of the mixture described above can be carried out according to any known extrusion process. Before extruding the actual mixture, it is also necessary to intimately mix said constituents of the sole.
• the preferred extrusion techniques are either extrusion-plastering or extrusion-calendering flat.
• a sheet or film of the mixture described above is thus obtained with a thickness of between 0.5 and 2 mm, and preferably between 0.9 and 1.4 mm.
• a variant of the ski sole manufacturing method according to the invention consists in incorporating into the mixture constituting the sole all or part of the waxes before extrusion. A more or less self-waxed sole is thus obtained, that is to say that the waxing of the ski provided with its sole will no longer be necessary.
• the self-waxing technique has the following advantages: - the sole can absorb a larger amount of wax. - the waxes being integrated into the structure of the sole, they are permanently maintained in this structure and the ski is waxed once and for all.
• farts we mean both gliding waxes, used more specifically for downhill skis and retaining farts, more specifically used for cross-country skis.
• the so-called sliding waxes generally have the main function of improving the sliding of the ski on snow by significantly reducing the coefficient of friction of said sole.
• So-called retaining farts mainly have an anti-kickback function: snow crystals can penetrate the surface layer of wax and they thus give the sole the anchoring properties necessary for good support of the ski on snow, preventing it to slide in a direction not desired by the skier.
• the bonding of the sole to the ski blank can be done according to a known method. For example, one can operate by flaming: the film or sheet is heated and applied with pressure on the ski blank.
• the present invention also applies advantageously to the production and use of a sheet or film based on one or more polyetheresteramides and one or more polyolefins as described above as a sliding surface for objects whose function is to slide on a liquid or solid surface such as water, snow, grass ...
• HDPE high density polyethylene
• PTMG polyether sequences
• the granules of the constituents described in 1.A are mechanically mixed.
• the mixture thus obtained is then introduced into a single-screw extruder whose speed of rotation of the screw is 100 revolutions / min.
• the assembly is brought to a temperature between 225 and 230 ° C.
• HDPE alone is extruded under the same conditions as above in order to obtain a continuous sheet 1.2 mm thick and 105 mm wide (SAMPLE 2).
• connection angle ⁇ made by a drop of standard liquid deposited on a side kept horizontal of the sheets of SAMPLES 1 and 2.
• connection angle The method of measuring the connection angle is described in the article by W.D. WARKINS, The Physical Chemistry of Surface Films, p 41. Reinhold Pub. Corp. 1952.
• connection angle measurements are carried out successively at 25 ° C on both sides of the samples.
• the standard liquids used are: - diodomethane, ⁇ -bromonaphthalene (slightly polar liquids) - water, formamide (polar liquids)
• a drop of 1 to 5 ⁇ l of standard liquid is placed on the horizontal side of the sheet.
• connection angle ⁇ made by the drop with the horizontal surface on which it was deposited.
• SAMPLING 1 Mixture of HDPE and polyetheresteramide
• SAMPLING 2 HDPE alone
• the polar contribution is equal to 6.7 m Nm ⁇ 1 for SAMPLE 1 while it is zero for SAMPLE 2.
• the whole is brought to 230 ° C., the speed of rotation of the screw is 150 rpm and the flow rate of the material is 17 kg / h.
• Granules are obtained which are extruded under conditions identical to those of EXAMPLE 1 in order to obtain a continuous sheet 1.2 mm thick and 105 mm wide.
• HDPE alone is extruded (the characteristics of which are those described in 2.A) under the same conditions in order to obtain a continuous sheet of HDPE 1.2 mm thick and 105 mm wide.
• the sheets thus produced are capable of being bonded to a ski blank and the ski thus produced can then undergo waxing.

Landscapes

• Compositions Of Macromolecular Compounds (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
• Laminated Bodies (AREA)
• Polyamides (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9363098

Family Applications (1)

Country Status (10)

Cited By (9)

Families Citing this family (5)

Citations (3)

Family Cites Families (7)

• 1988
  • 1988-02-09 FR FR8801519A patent/FR2626778B1/fr not_active Expired - Lifetime
• 1989
  • 1989-01-20 CA CA000588729A patent/CA1332018C/fr not_active Expired - Fee Related
  • 1989-02-02 EP EP19890400297 patent/EP0328439A1/fr not_active Ceased
  • 1989-02-03 KR KR1019890001296A patent/KR930000831B1/ko not_active IP Right Cessation
  • 1989-02-07 JP JP1028544A patent/JPH01223982A/ja active Pending
  • 1989-02-07 NO NO890491A patent/NO171399C/no unknown
  • 1989-02-08 DK DK056789A patent/DK56789A/da not_active Application Discontinuation
  • 1989-02-08 PT PT89650A patent/PT89650B/pt not_active IP Right Cessation
  • 1989-02-08 FI FI890606A patent/FI93611C/fi not_active IP Right Cessation
  • 1989-02-09 US US07/308,019 patent/US5069976A/en not_active Expired - Fee Related

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events