Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1992-04-24
1992-11-10
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 73, 521134, 521145, C08J 900
Patent
active
051623803
ABSTRACT:
Foamed articles of polyvinyl chloride resins are prepared by mixing an organic foaming agent having a temperature of foaming by decomposition of 100.degree. C. or above and a plasticizer with a polyvinyl chloride resin containing epoxy group which is formed into particles having an average diameter in the range from 0.05 to 5 .mu.m and has a concentration of the epoxy group at the surface of the particle of 1.times.10.sup.-2 weight % or more and a concentration of the total epoxy group in the particles of the said resin of 10 weight % or less at a temperature where the organic foaming agent does not decompose and coating or molding the mixed compound with foaming by heating.
Foamed articles of polyvinyl chloride resins having excellent physical properties and high expansion ratios can be prepared without utilizing a crosslinking agent at the ambient pressure.
REFERENCES:
patent: 3802949 (1974-04-01), Brown et al.
patent: 4031045 (1977-06-01), Goswarni
patent: 4689355 (1987-08-01), Treptow et al.
Hori Toshihiko
Ueki Kazunori
Foelak Morton
Nippon Zeon Company Limited
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