US 6,303,669 B1 · Flexible polyurethane foam

Abstract

The present invention provides a flexible polyurethane foam having good resistance to wet heat aging and resistance to ozone deterioration and a speaker edge having an excellent waterproofness comprising such a flexible polyurethane foam. As a polyol, a polyol component obtained by mixing a polyester polyol having an excellent compatibility with polyether polyol such as adipate of a long-chain alkylene glycol having at least 5 carbon atoms with a foaming agent, a catalyst, a foam stabilizer, etc. is reacted with a polyisocyanate to obtain a flexible polyurethane foam having good resistance to wet heat aging and resistance to ozone deterioration. Further, the incorporation of a specific aromatic secondary amine compound, a monofunctionally-terminated compound and an ultraviolet absorbent in the foam composition makes it possible to obtain a flexible foam having better resistance to ozone deterioration and weather resistance. The flexible foam can provide a speaker edge having a small drop of strength and elongation due to compression molding and excellent waterproofness and weather resistance in combination.

Claims22

Dependent claims

A flexible polyurethane foam obtained by the reaction of a composition comprising:

(a) a polyisocyanate, and
(b) a polyol component comprising a polyether polyol and a polyester polyol, said polyester polyol having a total number of hydrocarbon groups “n” between ester moieties, such that at least n/3 of said hydrocarbon groups have 5 or more carbon atoms, said polyester polyol being prepared by one of the following reactions:
(i) reacting a long-chain polyvalent alcohol with a long-chain dibasic acid;
(ii) reacting a long-chain polyvalent alcohol with a short-chain dibasic acid;
or
(iii) reacting a short-chain polyvalent alcohol with a long-chain dibasic acid;
wherein the following definitions apply to reactions (i), (ii) and (iii):
the long-chain polyvalent alcohol is a polyvalent dimer diol having a hydrocarbon group having at least 5 carbon atoms;
the short-chain polyvalent alcohol is a polyvalent alcohol having a hydrocarbon group having not more than 4 carbon atoms;
the long-chain dibasic acid is a dibasic dimeric acid having a hydrocarbon group having at least 5 carbon atoms;
and the short-chain dibasic acid is a dibasic acid having a hydrocarbon group having not more than 4 carbon atoms.

8 more elements

Dependencies are inferred from the claim text.

Flexible polyurethane foam

Life of this patent

Flexible polyurethane foam

Life of this patent

Abstract

Claims22