Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1989-09-01
1991-02-05
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521177, 521 70, 521 79, 427261, 427264, 427273, 427336, 427352, 427373, C08G 1814
Patent
active
049905457
ABSTRACT:
A thermoplastic or thermoset article, a porous sheet, a paint composition, and a synthetic leather which are characterized with a memory shape or a healable characteristics comprising a polyurethane resin obtained by reacting a polyisocyanate and aromatic and/or alicyclic polyol is disclosed. The polyurethane comprises at least 15% by weight in total of a ring component derived from the above polyol.
The original (memorized) shape of the article or the porous sheet is reshaped into another desired form below 130.degree. C., and locked into below 40.degree. C. Those material can be reverted back to their original shape by heating above 40.degree. C. The memorized shape as an original shape of the thermoplastic article or the porous sheet can be changed by maintaining it in a desired shape at a temperature 130.degree..about.230.degree. C.
When the paint or the synthetic leather is scratched or creased to its surface, they can be healed by heating above 40.degree. C.
REFERENCES:
patent: 3563973 (1971-02-01), Arditti et al.
patent: 4193899 (1980-03-01), Brenner et al.
patent: 4637944 (1987-01-01), Walker
Hourai Kouzi
Ikegami Katsuhiko
Kobayashi Yoshio
Sanyo Chemical Industries Ltd.
Welsh Maurice J.
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