Uv curable coatings containing oxalanilide stabilizers, method of curing; and coated substrates therefrom
申请人:PPG INDUSTRIES, INC.
公开号:EP0333008A2
公开(公告)日:1989-09-20
Disclosed is a coating composition which crosslinks upon exposure to ultraviolet radiation to produce a transparent coating. The coating composition comprises: (A) from 4 to 10 percent of an oxalanilide ultraviolet light (UV) stabilizer dissolved in the coating composition, the UV stabilizer corresponding to the formula
in which R is C₆₋₂₂ alkyl or C₆₋₂₂ alkoxy, R₁ and R₂ are independently hydrogen, C₁₋₈ alkyl, C₁₋₁₂ alkoxy, C₁₋₁₂ alkylthio, phenoxy or phenylthio, provided that R₁ and R₂ may not both be selected from alkylthio, phenoxy and phenylthio, and R₃ is hydrogen or C₁₋₈ alkyl; (B) from 20 to 80 percent of a radiation sensitive monomer having at least two addition polymerizable unsaturated bonds; (C) from 0.1 to 5.0 percent of a photopolymerization initiator; and (D) from 80 to 20 percent of an acrylic addition polymer having at least one amino group and having a number average molecular weight of about 8,000 - 70,000, the addition polymer being derived from a mixture of copolymerizable ethylenically unsaturated monomers containing a monomeric ethylenically unsaturated amine. The percentage of components (A), (B), (C) and (D) are by weight based on nonvolatile components (i.e., solids) of the coating composition.
Also disclosed is a method of coating comprising: (I) applying to the metallized surface of a metallized, plastic substrate a film of the coating composition of the invention and (II) curing the film by exposing it to ultraviolet radiation.
Also disclosed is a metallized plastic substrate having directly adhered to the metallized surface thereof, a transparent, crosslinked film produced by the method of the invention.
本发明公开了一种涂料组合物,该组合物在暴露于紫外线辐射时会发生交联,从而产生透明涂层。该涂料组合物包括: (A) 4%至 10%的草酰苯胺紫外线(UV)稳定剂溶解在涂料组合物中,该 UV 稳定剂对应于式
其中 R 是 C₆₋₂₂ 烷基或 C₆₋₂₂ 烷氧基,R₁ 和 R₂ 独立地是氢、C₁₋₈ 烷基、C₁₋₁₂ 烷氧基、C₁₋₁₂ 烷硫基、苯氧基或苯硫基、苯氧基或苯硫基,但 R₁ 和 R₂ 不能同时选自烷基硫基、苯氧基和苯硫基,且 R₃ 是氢或 C₁₋₈ 烷基;(B) 20%至 80%的辐射敏感单体,该单体具有至少两个可加成聚合的不饱和键; (C) 0.1%至 5.0%的光聚合引发剂;以及 (D) 80%至 20%的丙烯酸加成聚合物,该加成聚合物具有至少一个氨基,其平均分子量约为 8,000 - 70,000,该加成聚合物来自含有单体乙烯基不饱和胺的可共聚乙烯基不饱和单体的混合物。组分 (A)、(B)、(C) 和 (D) 的重量百分比是基于涂料组合物的非挥发性组分(即固体)。
还公开了一种涂布方法,包括:(I) 在金属化塑料基材的金属化表面上涂布本发明涂料组合物薄膜;(II) 将薄膜置于紫外线辐射下固化。
本发明还公开了一种金属化塑料基材,其金属化表面直接附着一层用本发明方法制得的透明交联薄膜。