Modified low-density polyurethane foam body

Details Modified low-density polyurethane foam body Modified low-density polyurethane foam body

1993-04-08

1993-12-21

Foelak, Morton

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

521 54, 521 55, C08J 9236

Patent

active

052720012

ABSTRACT:
A low-density, open-cell flexible polyurethane foam body that is modified to impart resilience and enhanced shock-absorbency properties thereto. Modification is effected by implanting in the open cells of the body expandable microspheres having particle sizes in the micron range, each microsphere being formed by a gas proof polymeric shell encapsulating a drop of liquid isobutane. The microspheres are expanded by heat to more than fifty times their initial volume and are entrapped in the open cells of the body. The expanded microspheres are constituted by a soft polymeric shell enclosing a compressible gas, the expanded microspheres behaving as miniature springs dispersed throughout the body.

REFERENCES:
patent: 3615972 (1971-10-01), Morehouse, Jr. et al.
patent: 4006273 (1977-02-01), Wolinski
patent: 4320076 (1982-03-01), Greenwood
patent: 4771079 (1988-09-01), Melber

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