| 摘要 |
<p>1516065 Drafting sheet material KEUFFEL & ESSER CO 14 Feb 1977 [12 Feb 1976] 6127/77 Heading C3P Drafting material comprises a sheet having a coating of a composition comprising finely divided pigment dispersed throughout a binder matrix comprising a solid cross-polymerized reaction product of a liquid acrylic or methacrylic ester and a polyene/polythiol blend, and may be prepared by photopolymerizing on the sheet a coating of pigment dispersed in said ester and blend. The coating composition may also contain epoxidized drying oil acrylates and radiation sensitizers, e.g. benzoin isobutyl ether. The pigment may be silica, optionally with titanium dioxide. Specified acrylic asters are neopentyl glycol diacrylate, trimethylolpropane triacrylate, 1,3-bityleneglycol diacrylate and tetraethyleneglycol diacrylate.</p> |
