Polyester resin and laminate paper using the same
AssigneeMitsubishi Engineering-Plastics Corporation
InventorsShintarou Kishimoto, Michio Nakata
Life of this patent
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Abstract
A polyester laminate paper with excellent adhesiveness, thermal resistance, moldability and the like as prepared by laminating a polyester resin in a pellet form on at least one of the faces of a paper, the polyester resin containing a butylene terephthalate recurring unit as the main component and satisfying the following conditions (1) and (2): (1) the melt tension thereof at 250° C. is 0.5 to 2.5 mN; and (2) the difference (ΔIV) between the intrinsic viscosity of pellet surface part IV (S) and the intrinsic viscosity of pellet center part IV (C) is 0.1 or less.
Claims24
A polyester resin (A) in a pellet form for use in laminate paper, which contains a butylene terephthalate recurring unit as the main component and satisfies the following conditions (1) and (2):
- (1) the melt tension thereof at 250° C. is 0.5 to 2.5 mN;
- and
- (2) the difference (ΔIV) between the intrinsic viscosity of pellet surface part IV (S) and the intrinsic viscosity of pellet center part IV (C) is 0.1 or less.
A polyester laminate paper prepared by laminating a polyester resin (A) in a pellet form on at least one of the faces of a paper, wherein the polyester resin (A) contains a butylene terephthalate recurring unit as the main component and satisfies the following conditions (1) and (2):
- (1) the melt tension thereof at 250° C. is 0.5 to 2.5 mN;
- and
- (2) the difference (ΔIV) between the intrinsic viscosity of pellet surface part IV (S) and the intrinsic viscosity of pellet center part IV (C) is 0.1 or less.
A method for producing a polyester laminate paper comprising extruding and laminating a polyester resin (A) in a pellet form on at least one of the faces of a paper, wherein the polyester resin (A) contains a butylene terephthalate recurring unit as the main component and satisfies the following conditions (1) and (2):
- (1) the melt tension thereof at 250° C. is 0.5 to 2.5 mN;
- and
- (2) the difference (ΔIV) between the intrinsic viscosity of pellet surface part IV (S) and the intrinsic viscosity of pellet center part IV (C) is 0.1 or less.
A polyester resin composition for use in laminate paper, which is prepared by blending a release agent in a polyester resin containing a butylene terephthalate recurring unit as the main component at 0.001 to 5.0% by weight.
Dependencies are inferred from the claim text.