Laminated safety glass and polymeric laminate for use therein

A polymeric laminate comprising a first layer of plasticized polyvinyl butyral in face to face contact with a second layer comprising a clear polymeric film of biaxially stretched polyester or polyurethane, said first layer containing 0.01 to 0.1 weight %, based on polyvinyl butyral, of one or more glass adhesion control agents selected from monovalent and divalent metal salts of C.sub.1 to C.sub.8 aliphatic monocarboxylic acids and mixtures of such monovalent and divalent salts, said polyvinyl butyral having a hydroxyl content, calculated as polyvinyl alcohol, of 17 to 22 weight percent;

• said laminate possessing the following properties at a water content in the first layer of:
• (a) 0.2 to 0.5 weight percent
• (i) peel adhesion to glass at 21.degree. C. of less than 65 newtons per cm;
• (b) 2 to 2.8 weight percent
• (i) peel adhesion to glass at 21.degree. C of at least 8 newtons per cm;
• and
• (ii) less than 3 percent optical haze.

Laminated safety glass comprising at least one sheet of glass having adhered to its surface a polymeric laminate comprising a first layer of plasticized polyvinyl butyral in face to face contact with a second layer comprising a clear polymer film or coating, said first layer containing about 0.01 to 0.1 weight percent, based on polyvinyl butyral, of an adhesion control agent other than water, said polyvinyl butyral having a hydroxyl content, calculated as polyvinyl alcohol, of 17 to 22 weight percent;

• said laminate possessing the following properties at a water content in the first layer of:
• (a) 0.2 to 0.5 weight percent
• (i) peel adhesion to glass at 21.degree. C of less than 65 newtons per cm;
• (b) 2 to 2.8 weight percent
• (i) peel adhesion to glass at 21.degree. C of at least 5 newtons per cm;
• and
• (ii) less than 3 percent optical haze.

Laminated safety glass comprising a single sheet of glass having adhered to its surface a polymeric laminate comprising a first layer of plasticized polyvinyl butyral in face to face contact with a second layer comprising a clear polymer film or coating, said first layer containing about 0.01 to 0.1 weight percent, based on polyvinyl butyral, of an adhesion control agent other than water, said polyvinyl butyral having a hydroxyl content, calculated as polyvinyl alcohol, of 17 to 22 weight percent;

• said laminate possessing the following properties at a water content in the first layer of:
• (a) 0.2 to 0.5 weight percent
• (i) peel adhesion to glass at 21.degree. C. of less than 45 newtons per cm;
• (b) 2 to 2.8 weight percent
• (i) peel adhesion to glass at 21.degree. C. of at least 8 newtons per cm;
• and
• (ii) less than 3 percent optical haze.