Acid-modified polyester resin, laminate and biodegradable adhesive
AssigneeMitsubishi Chemical Corporation
InventorsTakahiro SAKA, Masahiko TANIGUCHI
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Abstract
An aspect of the present invention relates to an acid-modified polyester-based resin in which an α,β-unsaturated carboxylic acid and/or an anhydride thereof (X) is grafted to an aliphatic-aromatic polyester-based resin containing an aliphatic diol unit, an aliphatic dicarboxylic acid unit, an aromatic dicarboxylic acid unit, the acid-modified polyester-based resin has a melt flow rate (210° C., load: 2160 g) of 1.4 g/10 min to 15 g/10 min, and a content of the α,β-unsaturated carboxylic acid and/or an anhydride thereof (X) is 0.0001 to 0.8 parts by mass with respect to 100 parts by mass of the aliphatic-aromatic polyester-based resin.
Claims14
An acid-modified polyester-based resin wherein an α,β-unsaturated carboxylic acid and/or an anhydride thereof (X) is grafted to an aliphatic-aromatic polyester-based resin containing an aliphatic diol unit, an aliphatic dicarboxylic acid unit, and an aromatic dicarboxylic acid unit,
- the acid-modified polyester-based resin has a melt flow rate (210° C., load:
- 2160 g) of 1.4 g/10 min to 15 g/10 min, and
- a content of the α,β-unsaturated carboxylic acid and/or an anhydride thereof (X) is 0.0001 to 0.8 parts by mass with respect to 100 parts by mass of the aliphatic-aromatic polyester-based resin.
An acid-modified polyester-based resin, wherein a temperature-dependent coefficient α determined by plotting an MFR (melt flow rate) change rate coefficient K, which is calculated by plotting a change of an MFR over time during storage at a plurality of temperatures according to the following formula (I), at each storage temperature based on the following formula (II) satisfies the following formula (III):
- MFR
-
- (
- t
- )
- =
- MFR
-
- (
- 0
- )
- ×
- e
- ^
- (
- -
- K
- ×
- t
- )
- (
- I
- )
- ln
-
- (
- K
- )
- =
- α
- /
- T
- +
- β
- (
- II
- )
- ❘
- "\[LeftBracketingBar]"
- α
- ❘
- "\[RightBracketingBar]"
- <
- 10000
- (
- III
- )
- (in the above formula (I), MFR(t) represents the MFR (210° C., load:
- 2160 g) of the resin after t days of storage, MFR(0) represents the MFR (210° C., load:
- 2160 g) of the resin at start of storage, K is the MFR change rate coefficient, and t is an elapsed time (days) from the start of storage;
- in the above formula (II), T represents the storage temperature (K), and β represents a constant term;
- and in the above formula (II) and formula (III), a represents the temperature-dependent coefficient of the MFR change rate coefficient).
Dependencies are inferred from the claim text.