Polyester resin for heat-shrinkable film, heat-shrinkable film, heat-shrinkable label, and packaged product

Patent metadata

Field	Value
Publication number	US-11084901-B2
Application number	US-201816603580-A
Country	US
Kind code	B2
Filing date	Apr 16, 2018
Priority date	Apr 27, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

The invention provides a polyester resin for heat-shrinkable film which contains terephthalic acid as a main component of a dicarboxylic acid component, contains ethylene glycol as a main component of a diol component, and contains from 18 to 32% by mol of neopentyl glycol and from 8 to 16% by mol of diethylene glycol when a total amount of the whole diol component in total polyester resin components is taken as 100% by mol. The polyester resin has an intrinsic viscosity (IV) of from 0.70 to 0.86 dl/g, a carboxyl end group concentration (AV) of from 8 to 25 eq/t, and a color b value of from 1.0 to 12.0 in an L*a*b color system. The invention also provides a heat-shrinkable film prepared from the aforementioned polyester resin, as well as a heat-shrinkable label and packaged product.

First claim

The invention claimed is:

1. A polyester resin for a heat-shrinkable film which contains terephthalic acid as a main component of a dicarboxylic acid component, contains ethylene glycol as a main component of a diol component, and contains from 18 to 32% by mol of neopentyl glycol and from 8 to 16% by mol of diethylene glycol when a total amount of the whole diol component in total polyester resin components is taken as 100% by mol, characterized in that it satisfies the following requirements (i) to (iii):
(i) the polyester resin has an intrinsic viscosity (IV) of from 0.70 to 0.86 dl/g;
(ii) the polyester resin has a carboxyl end group concentration (AV) of from 8 to 25 eq/t; and
(iii) the polyester resin has a color b value of from 1.0 to 12.0 in an L*a*b color system.

2. A heat-shrinkable film, characterized in that, it contains the polyester resin for heat-shrinkable film mentioned in claim 1 .

3. A heat-shrinkable label which is characterized in being prepared by using the heat-shrinkable film mentioned in claim 2 .

4. A packaged product which is characterized in being formed by coating the heat-shrinkable label mentioned in claim 3 at least on a part of an outer periphery of a target to be packaged followed by subjecting to a heat-shrinking treatment.

Assignees

• Toyo Boseki

Inventors

• MINAMI Soichiro
• Ohashi Hideto
• Haruta Masayuki
• Ishimaru Shintaro

Classifications

• B29K2995/002

  Coloured · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• B65D65/00

  Wrappers or flexible covers; Packaging materials of special type or form (wrappers or envelopes with shock-absorbing properties B65D81/03) · CPC title

• C08G63/672 Primary

  Dicarboxylic acids and dihydroxy compounds · CPC title