Laminate

Details Laminate Laminate

1998-01-20

1999-11-23

Nakarani, D. S.

Stock material or miscellaneous articles

Composite

Of polyamidoester

4284233, 4284237, 4284258, B32B 2108, B32B 2740, C09D17504

Patent

active

059897155

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a layer product based on thermoplastic polyurethanes which is particularly suitable for producing skis, surfboards and furniture.


BACKGROUND AND SUMMARY OF THE INVENTION

EP-A-287911 discloses five- or six-component layer products and their use for the production of skis, surfboards and furniture parts. Individually, the layers consist of a film of highly transparent thermoplastic, a polyurethane layer which is tack-free at room temperature, a colour layer, an epoxy resin layer and a support and core material of rigid polyurethane foam, wood or aluminum.
FR-A-2660251 likewise discloses a multilayer system which can be used for skis. It describes inter alia a three-layer system consisting of polycarbonate, polyamide and thermoplastic polyurethane.
A disadvantage of the prior art is that the layer products used to date are insufficiently stable to ultraviolet radiation. For this reason, the layer products are generally provided with a clearcoat layer comprising a special UV absorber system.
The object of the present invention, accordingly, was to develop a layer product which renders superfluous the use of a clearcoat layer comprising a special UV absorber system.
This object is surprisingly achieved by means of a layer product consisting of thermoplastic polyurethane which is stabilized against ultraviolet radiation and is based on diisocyanates, diols as chain extenders, polytetrahydrofuran or linear polyesterdiols.


DETAILED DESCRIPTION

Thermoplastic polyurethanes of this kind can be prepared, for example, according to the belt method or the extruder method, by reacting aromatic diisocyanates, of, if desired,
The starting materials (a) to (c), catalysts (d), auxiliaries and additives (e) which can be used for this purpose are described in more detail below: cycloaliphatic and, in particular, aromatic diisocyanates. Specific examples are aliphatic diisocyanates, such as hexamethylene 1,6-diisocyanate, methylpentamethylene 1,5-diisocyanate, 2-ethylbutylene 1,4-diisocyanate or mixtures of at least 2 of the C.sub.6 -alkylene diisocyanates mentioned, pentamethylene 1,5-diisocyanate and butylene 1,4-diisocyanate, cycloaliphatic diisocyanates, such as isophorone diisocyanate, 1,4-cyclohexane diisocyanate, 1-methyl-2,4- and -2,6-cyclohexane diisocyanate and the corresponding isomer mixtures, 2,4'-, and 2,2'-dicyclohexylmethane diisocyanate and the corresponding isomer mixtures, and, preferably, aromatic diisocyanates, such as 2,4-tolylene diisocyanate, mixtures of 2,4- and 2,6-tolylene diisocyanate, 4,4'-, 2,4'- and 2,2'-diphenylmethane diisocyanate, mixtures of 2,4'- and 4,4'-diphenylmethane diisocyanate, urethane-modified liquid 1,2-bis(4,4'- and/or 2,4'- or 4,4'-diisocyanatodiphenyl) ethane and 1,5-naphthylene diisocyanate. Preference is given to the use of hexamethylene 1,6-diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate isomer mixtures having a 4,4'-diphenylmethane diisocyanate content of more than 96% by weight, and, in particular, 4,4'-diphenylmethane diisocyanate. having molecular weights of from 500 to 8000 are preferably polyetherols and polyesterols. Also suitable, however, are hydroxyl-containing polymers, for example polyacetals, such as polyoxymethylenes and, in particular, water-insoluble formals, for example polybutanediol formal and polyhexanediol formal, and aliphatic polycarbonates, especially those of diphenyl carbonate and 1,6-hexanediol, prepared by transesterification and having the abovementioned molecular weights. The polyhydroxy compounds must be at least predominantly linear in structure, i.e. difunctional in structure in the context of the isocyanate reaction. The polyhydroxy compounds mentioned can be employed as individual components or in the form of mixtures.
Suitable polyetherols can be prepared by known methods, for example by anionic polymerization with alkali metal hydroxides, such as sodium hydroxide or potassium hydroxide, or alkali metal alcoholates, such a

REFERENCES:
patent: 3499783 (1970-03-01), Nelson et al.
patent: 4355071 (1982-10-01), Chang
patent: 5030514 (1991-07-01), Hartman
patent: 5288549 (1994-02-01), Zeitler et al.

Affiliated with

Also associated with

Rating

Laminate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Laminate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laminate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1219401