Semi-rigid polyurethane foam
AssigneeKao Corporation
InventorsMitsuru Sakai, Atsushi Ishikawa, Masayoshi Morii
Life of this patent
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Abstract
A semi-rigid polyurethane foam having a strength retention of not less than 70% when allowing it to stand at 120° C. for 24 hours, and a Haze value of not more than 2 as determined by Fogging test, prepared by mixing a polyol mixture comprising a polyol, water and a catalyst with a polyisocyanate, and foaming the resulting mixture, and a process for preparing the same. The semi-rigid polyurethane foam would not cause fogging under high-temperature conditions, and can be suitably used for interior materials of automobiles such as headrests and armrests.
Claims7
A semi-rigid polyurethane foam having a strength retention of not less than 70% when allowing it to stand at 120° C. for 24 hours, and a Haze value of not more than 2 as determined by Fogging test, prepared by mixing a polyol mixture comprising a polyol, water and an amine catalyst having a primary hydroxyl group in its molecule with a polyisocyanate, and foaming the resulting mixture;
- wherein said amine catalyst is a dimethylaminoalkyl alcohol represented by the following formula (I):
- (CH3)2N—(CH2)p—OH (I)
- wherein p is an integer of 4 to 8.
A process for preparing a semi-rigid polyurethane foam having a strength retention of not less than 70% when allowing it to stand at 120° C. for 24 hours, and a Haze value of not more than 2 as determined by Fogging test, comprising mixing a polyol mixture comprising 100 parts by weight of a polyol, 2 to 8 parts by weight of water, and 0.5 to 6 parts by weight of an amine catalyst having a primary hydroxyl group in its molecule with a polyisocyanate, and foaming the resulting mixture;
- wherein said amine catalyst is a dimethylaminoalkyl alcohol represented by the following formula (I):
- (CH3)2N—(CH2)p—OH (I)
- wherein p is an integer of 4 to 8.
Dependencies are inferred from the claim text.