Viscoelastic Polyurethane Foam

摘要

The subject disclosure provides a viscoelastic polyurethane foam and a method of forming the viscoelastic polyurethane foam. The viscoelastic polyurethane foam comprises the reaction product of a toluene diisocyanate and an isocyanate reactive component. The isocyanate reactive component comprises a first polyether triol, a second polyether triol, an amino alcohol chain extender, and a hydrolyzable polyether polydimethylsiloxane copolymer. The first polyether triol has a weight-average molecular weight of from 500 to 5,000 g/mol, at least 60 parts by weight ethyleneoxy units, based on the total weight of the first polyether triol, and at least 10% ethyleneoxy end caps. The second polyether triol, which is different from the first polyether triol, has a weight-aver age molecular weight of from 5,000 to 10,000 g/mol and at least 80% ethyleneoxy end caps.

主权项

1. A viscoelastic polyurethane foam comprising a reaction product of:
(A) a toluene diisocyanate; and (B) an isocyanate reactive component comprising:
i. a first polyether triol having;
a. a weight-average molecular weight of from 500 to 5,000 g/mol;b. at least 60 parts by weight ethyleneoxy units, based on the total weight of the first polyether triol; andc. at least 10% ethyleneoxy end caps;ii. a second polyether triol, different from said first polyether triol, having;
a. a weight-average molecular weight of from 5,000 to 10,000 g/mol; andb. at least 80% ethyleneoxy end caps;iii. an amino alcohol chain extender; andiv. a hydrolyzable polyether polydimethylsiloxane copolymer;wherein said first polyether triol and said second polyether triol are present in said isocyanate reactive component in a weight ratio of from 1:1 to 5:1.