ApplicationNo. 05/915023 filed on 06/12/1978
US Classes:430/627, Resin or synthetic polymer containing430/495.1, RADIATION SENSITIVE PRODUCT430/533, Polyester or polycarbonate430/537, In nonradiation-sensitive layer including gelatin525/469Solid polymer derived from O-C(=O)-O- or hal-C(=O)- and polyhydroxy reactant derived from at least two polyhydroxy reactants
ExaminersPrimary: Welsh, John D.
Attorney, Agent or Firm
International ClassesC09J 167/00 (20060101)
C09J 167/02 (20060101)
G03C 1/91 (20060101)
G03C 1/93 (20060101)
G03C 8/52 (20060101)
G03C 8/00 (20060101)
C08G 63/00 (20060101)
C08G 63/672 (20060101)
AbstractDisclosed herein are heat-activatable adhesive compositions comprising an amorphous condensation polymer which is characterized by having an acid component comprising a phthalic acid derivative and a glycol component comprising from about 15 to about 85 mole percent of (1) a linear aliphatic glycol having the structure HO--R--H wherein R is either: ##STR1## or --CH2 CH2 O--n wherein n is an integer from 2 to 4; and from about 85 to about 15 mole percent of (2) a branched aliphatic glycol having the structure: ##STR2## wherein R1 and R2 are alkyl. These polyester adhesives are further characterized as being soluble in halogenated solvents, having glass transition temperatures within the range of about -30° C. to about 50° C., and having high bonding strengths at elevated temperatures. They have been found useful in a variety of photographic materials, and particularly in photographic film units.