Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1989-12-14
1991-05-07
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524789, 524493, 524492, 528 12, 528 26, 528 40, 10628713, 10628714, 10628716, C08K 505
Patent
active
050137883
ABSTRACT:
The invention provides a liquid coating composition for forming a transparent and hard coating film on a plastic member such as a polycarbonate or polymethyl methacrylate plate. The liquid composition comprises 100 parts by weight of an organotrialkoxysilane R.sup.1 Si(OR.sup.2).sub.3, where R.sup.1 is a C.sub.1 - or C.sub.2 -alkyl group and R.sup.2 is a C.sub.1 -, C.sub.2 - or C.sub.3 -alkyl group, 5-20 parts by weight of an organotrialkoxysilane R.sup.3 Si(OR.sup.2).sub.3, where R.sup.3 is an organic group containing epoxy group, 50-200 parts by weight of an aqueous colloidal silica sol in which the content of SiO.sub.2 is 10-40 wt %, and 0.5-3 parts by weight of a dicarboxylic acid (CF.sub.2).sub.n (COOH).sub.2, where n is an integer from 1 to 5, preferably hexafluoroglutaric acid. On a surface of a plastic member a coating film of this composition is partially cured at 70.degree.-150.degree. C. to turn into a fairly hard but still pliable film. Then the plastic member can be shaped so as to bend the coated surface without suffering from cracking or peeling of the partially cured film. After that the film is treated with an aqueous alkali solution and then further cured at 80.degree.-150.degree. C.
REFERENCES:
patent: 4277525 (1981-07-01), Nakayama et al.
patent: 4294950 (1981-10-01), Kato
patent: 4476281 (1984-10-01), Vaughn, Jr.
Hirukawa Masahiro
Kuramashi Haruki
Nagashima Toshikazu
Nishida Yoshihiro
Central Glass Company Limited
Hellender Karen A.
Michl Paul R.
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