Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1991-08-12
1992-09-29
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
5262196, 526227, C08F12014, C08F 434, C08F 404
Patent
active
051514826
ABSTRACT:
A monomer comprising methyl methacrylate either alone or in combination with another acrylic or methacrylic ester monomer is partially polymerized to prepare a syrup, to which an initiator including a peroxide having a 10-hour half-life temperature of 50.degree. to 58.degree. C. and 2,2'-azobisisobutyronitrile are added. The resulting syrup, after being poured into a mold, is initially polymerized in a first step at a temperature of 75.degree. to 90.degree. C. for a period of 5 to 15 minutes, then further polymerized in a second step at a temperature 3.degree. to 12.degree. C. lower than the temperature of the first step polymerization until a conversion of monomer to polymer of 80 to 95% is attained. The polymerization product which is now in the form of a sheet is then heat-treated at a temperature of 95.degree. to 140.degree. C. to obtain a methacrylic resin sheet. According to this process, methacrylic resin sheets having little residual monomer and being substantially free of defects can be manufactured with high productivity.
REFERENCES:
patent: 4328329 (1982-05-01), Novak
patent: 4588798 (1986-05-01), Heitner
Catalogue of "Organic Peroxides" published by Nippon Oil and Fats Co., Ltd. with its partial English translation.
"A new way to cast methyl methacrylate" by Plastics Engineering, May 1975, pp. 51-53.
Ikeda Hiroyuki
Saruta Masahiro
Sawano Tetuya
Shinka Michitoshi
Tayama Suehiro
Cheng Wu C.
Mitsubishi Rayon Co. Ltd.
Schofer Joseph L.
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