Process for producing elastic polyurethane moldings with compact surfaces and cellular cores
First Claim
1. A process for producing high elasticity polyurethane moldings having a compact surface and a cellular core comprising the step of reactinga) modified organic polyisocyanate with b) at least one compound containing at least two reactive hydrogen atoms and having a molecular weight of from 1000 to 8000, and optionally c) chain extenders, in the presence of d) blowing agents, e) catalysts and, if desired, f) auxiliaries and/or additives in a closed mold with compaction, wherein the modified organic polyisocyanate a) comprises the reaction product of 4,4′
- -diisocyanatodiphenylmethane with at least one polyoxypropylene polyol and/or polyoxypropylene-polyoxyethylene polyol, the modified organic polyisocyanate has an NCO content of <
15% by weight, the chain extenders c) comprise diols having a molecular weight of <
400, the weight ratio of a) to the sum of the components b) to f) in the reaction is greater than 1, the blowing agent d) comprises water, and wherein the components a) through f) are reacted in amounts sufficient to provide polyurethane moldings having a density below 400 grams per liter and a rebound resilience in accordance with DIN 53512 of at least 35%.
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Accused Products
Abstract
Elastic polyurethane moldings having a compact surface and a cellular core are produced by reacting
a) modified organic polyisocyanates with
b) at least one relatively high molecular weight compound containing at least two reactive hydrogen atoms and, if desired,
c) low molecular weight chain extenders in the presence of
d) blowing agents,
e) catalysts and, if desired,
f) customary auxiliaries and/or additives
in a closed mold with compaction, wherein the modified organic polyisocyanate used is at least one reaction product of pure MDI and at least one polyether alcohol (polyoxyalkylene polyol), the modified organic polyisocyanate having an NCO content of <15% by weight.
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Citations
16 Claims
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1. A process for producing high elasticity polyurethane moldings having a compact surface and a cellular core comprising the step of reacting
a) modified organic polyisocyanate with b) at least one compound containing at least two reactive hydrogen atoms and having a molecular weight of from 1000 to 8000, and optionally c) chain extenders, in the presence of d) blowing agents, e) catalysts and, if desired, f) auxiliaries and/or additives in a closed mold with compaction, wherein the modified organic polyisocyanate a) comprises the reaction product of 4,4′ - -diisocyanatodiphenylmethane with at least one polyoxypropylene polyol and/or polyoxypropylene-polyoxyethylene polyol, the modified organic polyisocyanate has an NCO content of <
15% by weight, the chain extenders c) comprise diols having a molecular weight of <
400, the weight ratio of a) to the sum of the components b) to f) in the reaction is greater than 1, the blowing agent d) comprises water, andwherein the components a) through f) are reacted in amounts sufficient to provide polyurethane moldings having a density below 400 grams per liter and a rebound resilience in accordance with DIN 53512 of at least 35%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- -diisocyanatodiphenylmethane with at least one polyoxypropylene polyol and/or polyoxypropylene-polyoxyethylene polyol, the modified organic polyisocyanate has an NCO content of <
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9. A high elasticity polyurethane molding having a compact surface and a cellular core, comprising the reaction product of
a) modified organic polyisocyanate with b) at least one compound containing at least two reactive hydrogen atoms and having a molecular weight of from 1000 to 8000, and optionally c) chain extenders, in the presence of d) blowing agents, e) catalysts and, if desired, f) auxiliaries and/or additives in a closed mold with compaction, wherein the modified organic polyisocyanate a) comprises the reaction product of 4,4′ - -diisocyanatodiphenylmethane with at least one polyoxypropylene polyol and/or polyoxypropylene-polyoxyethylene polyol, the modified organic polyisocyanate has an NCO content of <
15% by weight, the chain extenders c) comprise diols having a molecular weight of <
400, the weight ratio of a) to the sum of the components b) to f) in the reaction is greater than 1, the blowing agent d) comprises water, andwherein said polyurethane molding has a density below 400 grams per liter and a rebound resilience in accordance with DIN 53512 of at least 35%. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- -diisocyanatodiphenylmethane with at least one polyoxypropylene polyol and/or polyoxypropylene-polyoxyethylene polyol, the modified organic polyisocyanate has an NCO content of <
Specification