Patent ID: 11912002
Assignee: GUNZE LIMITED
Field: nan (nan)
Classification: CPC nan | IPC B  C  G

Claim 0:
1. A heat shrinkable multilayer film comprising:
front and back layers each containing a polyethyleneterephthalate resin;
an interlayer containing a polystyrene resin; and
adhesive layers,
wherein the front and back layers and the interlayer are stacked with the adhesive layers interposed therebetween, and
the adhesive layers each contain a polyester resin having a glass transition temperature of 65° C. or higher and 73° C. or lower,
the adhesive layers each contain 4 to 45% by weight of a polystyrene resin, 49 to 93% by weight of the polyester resin, and 0.8 to 26% by weight of a polyester elastomer,
the polyester resin constituting the adhesive layers contains a dicarboxylic acid component and a diol component,
wherein the polyester resin constituting the adhesive layers contains 67 to 100 mol % of a component derived from terephthalic acid and 0 to 33 mol % of a component derived from isophthalic acid in 100 mol % of the dicarboxylic acid component, and contains 63 to 100 mol % of a component derived from ethylene glycol, 0 to 22 mol % of a component derived from diethylene glycol, and 0 to 20 mol % of a component derived from 1,4-cyclohexanedimethanol in 100 mol % of the diol component,

the polystyrene resin constituting the adhesive layers is a styrene butadiene copolymer,
wherein a styrene content in 100% by weight of the polystyrene resin constituting the adhesive layers is 50 to 98% by weight and a butadiene content in 100% by weight of the polystyrene resin constituting the adhesive layers is 2 to 50% by weight, and

the polyester elastomer constituting the adhesive layers contains a polyester as a hard segment and a polyether as a soft segment.