Foam body made integrally of at least a layer of foam material h

Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...

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4283166, 521 97, 521 841, 521140, B32B 326, B32B 702

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active

052309479

ABSTRACT:
A foam body is made integrally of at least a layer of foam material having great resilience and at least a layer of foam material having great capability to absorb shock. The foam material having great capability to absorb shock is made from a first mixture while the foam material having great resilience is made from a second mixture. The first and the second mixtures contain respectively 5-50% by weight of acrylobutadiene rubber, 50-95% by weight of polyvinyl chloride, a plasticizer, a bridging agent, a foaming agent, an extrusion-aiding agent and other additives. The first mixture differs from the second mixture in that the former contains less than 50 parts by weight of the plasticizer and that the latter contains more than 50 parts by weight of the plasticizer. The first and the second mixtures are stacked orderly in a mold cavity in which they are heated under pressure to foam to take shape of the foam body.

REFERENCES:
patent: 5147707 (1992-09-01), Hasegawa et al.
patent: 5153052 (1992-10-01), Tanaka et al.

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