초록 ▼

Very low gloss finishes are attained in pigmented, radiation curable coatings by inclusion of a combination of photoinitiators having an acylphosphine oxide photoinitiator and a second photoinitiator such as an acetophenone derivative. In the method of producing the low gloss finishes, the coating i

Very low gloss finishes are attained in pigmented, radiation curable coatings by inclusion of a combination of photoinitiators having an acylphosphine oxide photoinitiator and a second photoinitiator such as an acetophenone derivative. In the method of producing the low gloss finishes, the coating is first exposed to ionizing radiation (e.g., electron beam) in air, then exposed to actinic radiation (ultraviolet light) in an essentially inert atmosphere. The low gloss is achieved by a fine, uniform surface wrinkling effect.

대표청구항 ▼

A pigmented, radiation curable coating composition adapted to produce a low gloss film, comprising: (a) a binder resin curable by radiation exposure in the presence of at least one photoinitiator compound, wherein (i) at least 90% by weight of the binder resin consists essentially of compounds selec

A pigmented, radiation curable coating composition adapted to produce a low gloss film, comprising: (a) a binder resin curable by radiation exposure in the presence of at least one photoinitiator compound, wherein (i) at least 90% by weight of the binder resin consists essentially of compounds selected from those whose curing by radiation exposure is substantially inhibited by the presence of oxygen, (ii) the binder resin is characterized by an average molecular weight less than 400 and an average crosslinking functionality less than 3.0, (iii) the binder resin does not contain substantial amounts of epoxy acrylate derivatives or allyl groups, and (iv) at least 10 weight percent of the binder resin is a polyacrylyloxy compound; (b) a first photoinitiator compound comprising an acylphosphine oxide; (c) a second photoinitiator compound comprising a substituted acetophenone derivative, wherein the weight ratio of the first photoinitator compound to the second photoinitiator compound ranges from between 0.05:1 to 1:1; and (d) pigment.