Polyurethane soft foam with sound insulating and vibration dampi

Details Polyurethane soft foam with sound insulating and vibration dampi Polyurethane soft foam with sound insulating and vibration dampi

1988-03-29

1989-06-13

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 454, 264 467, 264 51, 521174, C08G 1814

Patent

active

048393975

ABSTRACT:
The present invention relates to polyurethane foam materials with sound insulating and vibration damping properties. They are obtainable by reacting a polyisocyanate or polyisocyanate prepolymers with an excess of polyols or a mixture thereof while maintaining an NCO index of .ltoreq.80, in particular .ltoreq.70 and as a result they have an adhesive (frictional) surface and are further characterized by a density of 80 to 250 kg/m.sup.3, a modulus of elasticity less than 300 OOO N/m.sup.2 and a loss factor of at least 0.4. The production is preferably done by adding the reaction components (polyol system on the one hand and polyisocyanate system on the other) to the mixture head of an RIM machine. The polyurethane soft foam materials with an adhesive surface according to the invention are particularly suitable for use as vibration damping sound insulation systems in automobiles.

REFERENCES:
patent: 4544678 (1985-10-01), Hesman

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