Method of powder coating a glass container

Claim 1

A process for coating a glass container in order to prevent the scattering of glass fragments, said process comprising (A) preheating said glass container, (B) applying on the external wall surface of said container a powder composition comprising a melt blend mixture of (1) from about 25 to about 90% by weight of a block copolymer which is selectively hydrogenated to at least some degree and having at least two kinds of polymer blocks wherein one polymer block is designated by A and a second polymer block is designated by B such that prior to hydrogenation, (a) each A is a polymer end block of a monovinyl or alpha alkyl monovinyl arene having a number average molecular weight in the range of from about 5,000 to about 75,000, said blocks A comprising from about 5 to 50% by weight of the total block copolymer, and (b) each B is a polymer mid block having a number average molecular weight of from about 30,000 to about 300,000, and formed from a conjugated diene selected from homopolymers of at least one conjugated diene having 4 to 10 carbon atoms per molecule, said blocks B comprising from about 50 to about 95% weight of the total block copolymer, and (2) from about 10 to about 75% by weight of at least one melt flow modifier selected from the group consisting of (a) monovinyl arene homopolymers (b) alpha alkyl monovinyl arene homopolymers, and (c) copolymers of monovinyl arenes and alpha alkyl monovinyl arenes, wherein the aromatic portions of the polymers described in (2) (a), (b), and (c) are at least partially hydrogenated to remove the aromatic character thereof, (C) baking the coated container until the powder particles become molten and form a smooth, molten coating on the glass surface, and (D) cooling the coated container to substantially ambient temperature.