Waterproof and breathable flat materials made from resin mixture

Details Waterproof and breathable flat materials made from resin mixture Waterproof and breathable flat materials made from resin mixture

1995-11-22

1998-11-24

Sergent, Rabon

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525453, 525457, 525460, 8192, 4273899, 427392, 4273934, 427394, 524277, 524487, 156 60, 4283044, 42831111, 42831151, 4283197, 4284231, 4284251, C08L 7504, C08L 7508, D06M 13425, C08K 501

Patent

active

058408126

ABSTRACT:
The present invention relates to waterproof but breathable flat materials prepared from the melt from polymer resin mixtures consisting of at least two different melt processable polyurethanes, wherein the different thermoplastic polyurethanes have soft segments with different chemical constitutions, wherein the thermoplastic polyurethane which forms the matrix is a polyurethane with a ether based soft segment, wherein the ether segment has a carbon/oxygen atomic ratio of at least two and at most three and is present at a rate of 70-95 wt. % with reference to the total weight of thermoplastic polyurethanes used for melt processing to produce a flat material, and wherein the flat materials according to the invention have a higher permeability to water vapour, determined according to DIN 53 122, and a lower water absorption, determined according to DIN 53 495, method C, than flat materials made from one of the polyurethanes used for the polymer resin mixture.

REFERENCES:
patent: 5218058 (1993-06-01), Zeitler et al.
patent: 5238732 (1993-08-01), Krishnan
patent: 5239037 (1993-08-01), Krishnan
patent: 5331044 (1994-07-01), Lausberg et al.
patent: 5461122 (1995-10-01), Yilgor et al.

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