Method for making a pressure sensitive adhesive coated laminate

A method for making a laminate comprising coating a facing layer having outer and inner surfaces with a layer of a modified pressure sensitive adhesive to form a first laminate, subjecting said first laminate to conditions suitable to dry or cure the pressure sensitive adhesive, and marrying the pressure sensitive adhesive side of the thus treated first laminate to a release surface;

• said modified pressure sensitive adhesive comprising a pressure sensitive adhesive and means for decreasing the "zero minute peel value" of the facing layer-pressure sensitive adhesive layer combination, said means comprising a polysiloxane intimately mixed with the pressure sensitive adhesive, said polysiloxane being formed from monomeric units having structures (I) and (II) as follows:
• ##STR7## wherein R.sub.1 is selected from the group consisting of:
• (i) phenyl;
• (ii) methyl;
• (iii) tolyl;
• ##STR8## wherein R.sub.7 and R.sub.8 may be the same or different and may be hydrogen, methyl, or ethyl, and wherein when R.sub.1 is group (i), (ii), (iii) or (iv), the prime mole percent of structure (I) is from about 0.5 to 50 and the prime mole percent of structure (II) is from about 99.5 to 50, and
• (v) polyoxyalkylene having the structural formula
• --R.sub.5 (OC.sub.2 H.sub.4).sub.n (OC.sub.3 H.sub.6).sub.m OR.sub.6
• wherein R.sub.6 is hydrogen or a monovalent hydrocarbon group having from 1 to 10 carbon atoms, R.sub.5 is an alkylene group having at least two carbon atoms, n and m are zero or numbers, the sum of n and m is at least 1 and the oxyalkylene unit R.sub.6 O(C.sub.3 H.sub.6 O).sub.m (C.sub.2 H.sub.4 O).sub.n, has a molecular weight of at least about 80, and wherein there are at least two units having structure (I) and at least three units having structure (II) and wherein the oxyalkylene unit constitutes from about 85 to 30 weight percent of the polysiloxane polymer;
• R.sub.2 may be methyl, ethyl, or phenyl;
• and R.sub.3, and R.sub.4 may be the same or different and may be methyl or ethyl.

A pressure sensitive adhesive composition comprising a mixture of a pressure sensitive adhesive and a polysiloxane, said polysiloxane being formed from monomeric units having structures (I) and (II) as follows:

• ##STR10## wherein R.sub.1 is selected from the group consisting of:
• (i) phenyl;
• (ii) methyl;
• (iii) tolyl;
• ##STR11## wherein R.sub.7 and R.sub.8 may be the same or different and may be hydrogen, methyl, or ethyl, and wherein when R.sub.1 is group (i), (ii), (iii) or (iv), the prime mole percent of structure (I) is from about 0.5 to 50 and the prime mole percent of structure (II) is from about 99.5 to 50, and
• (v) polyoxyalkylene having the structural formula
• --R.sub.5 (OC.sub.2 H.sub.4).sub.n (OC.sub.3 H.sub.6).sub.m OR.sub.6
• wherein R.sub.6 is hydrogen or a monovalent hydrocarbon group having from 1 to 10 carbon atoms, R.sub.5 is an alkylene group having at least two carbon atoms, ln and m are zero or numbers, the sum of n and m is at least 1 and the oxyalkylene unit R.sub.6 O(C.sub.3 H.sub.6 O).sub.m (C.sub.2 H.sub.4 O).sub.n, has a molecular weight of at least about 80, and wherein there are at least two units having structure (I) and at least three units having structure (II) and wherein the oxyalkylene unit constitutes from about 85 to 30 weight percent of the polysiloxane polymer;
• R.sub.2 may be methyl, ethyl, or phenyl;
• and R.sub.3, and R.sub.4 may be the same or different and may be methyl or ethyl.