STERILISABLE POLYSILOXANE-MODIFIED POLYESTER COATINGS

It is known to prepare coatings which can be subjected to deformation processes such as deep drawing without delamination from the substrate. Unfortunately, such coatings do delaminate upon being subjected to sterilization procedures The present invention seeks to overcome this drawback by providing a coating composition comprising:(A) 5 to 30 parts by weight of aminoplasts derived from benzoguanamine resins; and(B) 95 to 70 parts by weight of the reaction product of (1) 99 to 89 parts by weight of a saturated polyester which consists of dicarboxylic acid residues wherein 85 to 50 mol % of the dicarboxylic acid residues are residues of aromatic dicarboxylic acids and 15 to 50 mol % of the dicarboxylic acid residues are residues of aliphatic dicarboxylic acids, provided that 100 to 40% of the residues of the aromatic dicarboxylic acids are residues of o-phthalic acid; and polyol residues wherein 85 to 100 mol % of the polyol residues are residues of dihydric alcohols; and 15 to 0 mol % of the polyol residues are residues of trihydric alcohols; and (2) 1 to 11 parts by weight of a polysiloxane of the formula wherein n is a number from 2 to 5, R1 and R4 independently represent C1-4 alkyl, phenyl, tolyl, and benzyl radicals; and R2 and R3 independently represent C1-4 alkyl, C1-4 alkoxy, phenyl, tolyl, or benzyl radicals,