Rigid polyvinyl chloride foam material

Details Rigid polyvinyl chloride foam material Rigid polyvinyl chloride foam material

1992-10-05

1993-08-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 81, 521 93, 521 96, 521134, 521136, 521145, 521149, 521150, C08J 914

Patent

active

052389669

ABSTRACT:
A rigid PVC foam material is made from a compound containing ingredients, such as polyvinyl chloride or vinyl chloroacetate copolymer, which is mixed with 5-50 parts by weight of ethylene vinyl acetate copolymer or ionized polyethylene resin or chloro sulfo polyethylene resin, 5-50 parts by weight of acrylobutadiene rubber or acrylic butadiene-styrene rubber or isoprene or natural rubber, 1-5 parts by weight of a stabilizer, 1-30 parts by weight of a chemical foaming agent, 0.2-5 parts by weight of a bridging agent, and 1-5 parts by weight of an extrusion-aiding agent. The mixture is extruded by a rolling machine at a temperature in a range of 100-150 degrees in Celsius and is subsequently transferred to a molding tool in which it is heated under a pressure and a temperature in a range of 120-170 degrees in Celsius for 10-60 minutes so as to bring about a foaming and bridging reaction.

REFERENCES:
patent: 4886837 (1989-12-01), Kim et al.
patent: 4956396 (1990-09-01), Kim et al.

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