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US 12,280,570 B2Granted
Laminate
AssigneeToppan Inc.
InventorsHaruna Kadoya, Shigeki Kudo
Life of this patent
Estimating the term…
Abstract
A laminate for forming a packaging bag including a substrate layer containing a crystalline polyester film, an adhesive layer, and a sealant layer containing the polyester film arranged in this order. The sealant layer has a ratio of a fracture elongation thereof to a thickness thereof which is 13%/um or less. The fracture elongation is a fracture elongation of the sealant layer as measured in a unit of 15 mm width thereof in an MD direction.
Claims10
A laminate for forming a packaging bag, consisting of:
- a substrate layer consisting of (a) a stretched crystalline polyester film consisting of polyethylene terephthalate, (b) a polyurethane resin adhesive layer in direct contact with the crystalline polyester film, and (c) a sealant layer consisting of a polyester film, which is in direct contact with the adhesive layer, wherein
- the polyester film of the sealant layer consists of a polyester obtained by condensation polymerization of a terephthalic acid and two or more diols;
- the two or more diols comprise ethylene glycol and one or more additional diols selected from the group consisting of neopentyl glycol, 1,4-butanediol, diethylene glycol and 1,4-cyclohexanedimethanol;
- the polyester film of the sealant layer has a stretch ratio in an MD direction from 1.1 to 3.0;
- the sealant layer has a ratio of a fracture elongation thereof to a thickness thereof which is 13%/μm or less, the fracture elongation being a fracture elongation of the sealant layer as measured in a unit of 15 mm width thereof in the MD direction, wherein the substrate layer is an outermost layer of the laminate and a tear strength of the laminate from 0.2 N to 0.6 N.
2 more elements
A laminate for forming a packaging bag, consisting of:
- (a) a substrate layer consisting of a stretched crystalline polyester film consisting of polyethylene terephthalate, (b) a vapor deposited layer of inorganic oxide on the crystalline polyester film, (c) a polyurethane resin adhesive layer in direct contact with the vapor deposited layer, and (c) a sealant layer containing a polyester film, which is in direct contact with the polyurethane resin adhesive layer, wherein the polyurethane resin adhesive layer consists of polyurethane resin adhesive;
- the polyester film of the sealant layer consists of a polyester obtained by condensation polymerization of a terephthalic acid and two or more diols;
- the two or more diols comprise ethylene glycol and one or more additional diols selected from the group consisting of neopentyl glycol, 1,4-butanediol, diethylene glycol and 1,4-cyclohexanedimethanol;
- the polyester film of the sealant layer has a stretch ratio in an MD direction from 1.1 to 3.0;
- the sealant layer has a ratio of a fracture elongation thereof to a thickness thereof which is 13%/μm or less, the fracture elongation being a fracture elongation of the sealant layer as measured in a unit of 15 mm width thereof in an MD direction, wherein the substrate layer is an outermost layer of the laminate and a tear strength of the laminate from 0.2 N to 0.6 N.
2 more elements
Dependencies are inferred from the claim text.