Method for producing a composite sheet material

Details Method for producing a composite sheet material Method for producing a composite sheet material

1983-11-22

1985-08-13

Lawrence, Evan K.

Coating processes

Foraminous product produced

Microporous coating

427341, 427342, 427368, B05D 310, B05D 312, B05D 500

Patent

active

045350094

ABSTRACT:
A method of providing a composite sheet material which has soft and pliable hand characteristics, despite being dense, and also high resistance against discoloration and deterioration. The method comprises impregnating and/or coating a fibrous sheet with a mixture of (A) a polyurethane elastomer containing a sterically hindered amino group within its molecular chain, (B) a compound selected from the group consisting of a polybasic acid and its halide, metal salt and ammonium salt, wherein one or more hydrogen atoms remain unreacted, which amount of (B) is within the range of 0.8-5 molar equivalents relative to the sterically hindered amino group, and (C) a solvent for the polyurethane elastomer (A), and subjecting the resulting material to wet coagulation.

REFERENCES:
patent: 4302493 (1981-11-01), Tanaka et al.

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