Patent ID: 6492032
Filing Date: 2002-12-10
Classification: C08K,G03C,Y10T

Abstract:
An optically brightened polyolefin resin comprising a polyolefin and an effective amount of optical brightener blend admixed therein wherein said optical brightener mixture comprises (a) from about 45 to 95 weight % of a mixture of benzoxazolyl stilbenes comprising (i) from about 25 to about 50 parts by weight of a first component selected from 4,4â€²-bis(benzoxazol-2-yl)stilbene and (ii) from about 75 to about 50 parts by weight of a second component selected from the group consisting of mono and di substituted benzoxazolyl stilbenes represented by the formula wherein R1-R4 are independently selected from the group consisting of hydrogen, an alkyl group having 1 to 15 carbon atoms, an alkoxyl group having 1 to 15 carbon atoms, an aryl group having from 6 to 15 carbon atoms and mixtures thereof; and (b) from about 55 to about 5 weight % of at least one bis(benzoxazolyl)naphthalene based brightener, bis(benzoxazolyl)thiophene based brightener, a pyrazoline based brightener, a coumarin based brightener, and mixtures thereof wherein said weight percents of (a) and (b) are based on the total weight of optical brighteners in said mixture.