Recyclable hot melt adhesive copolyester compositions
AssigneeEastman Chemical Company
InventorsMarc Alan Strand, Kayla Breanne Brickey
Life of this patent
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Abstract
Adhesive compositions made from blends of copolyester compositions which comprise residues of terephthalic acid, 1,4-cyclohexanedimethanol (CHDM), ethylene glycol (EG), neopentyl glycol (NPG), and/or 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) residues, in certain compositional ranges having certain advantages and improved properties including recyclability.
Claims20
An adhesive composition comprising a copolyester blend which comprises
- A) 25-75 wt % of at least one copolyester composition comprising:
- (a) a dicarboxylic acid component comprising:
- (i) 85 to 100 mole % of terephthalic acid residues, and
- (ii) 0 to 15 mole % of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms;
- and
- (b) a glycol component comprising:
- (i) 0 to 15 mole % of one or more of 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) residues;
- 1,4-cyclohexanedimethanol (CHDM) residues;
- NPG residues, and DEG residues, whether or not formed in situ;
- and
- wherein the remainder of the glycol component comprises:
- (ii) residues of ethylene glycol, and
- (iii) optionally, 0 to 10 mole % of the residues of at least one other modifying glycol;
- wherein the total mole % of the dicarboxylic acid component is 100 mole %, and wherein the total mole % of the glycol component is 100 mole %;
- and
- B) 75-25 wt % of at least one copolyester composition comprising
- (a) a dicarboxylic acid component comprising:
- (i) 85 to 100 mole % of terephthalic acid residues, and
- (ii) 0 to 15 mole % of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms;
- and
- (b) a glycol component comprising:
- (i) 20 to 50 mole % DEG residues;
- and
- (ii) 50-80 mole % of ethylene glycol (EG) residues, and
- (iii) optionally, 0 to 10 mole % of the residues of at least one other modifying glycol;
- wherein the total mole % of the dicarboxylic acid component is 100 mole %, and wherein the total mole % of the glycol component is 100 mole %;
- and
- wherein the copolyester blend has a melting temperature (Tm) of 190-255° C.;
- and
- wherein the Tg of the copolyester blend is from 50-80° C.;
- and
- wherein the inherent viscosity of the copolyester blend is from 0.60 to 1.0 dL/g;
- and wherein the adhesive composition provides a peel force of 2-12N.
A recyclable substrate comprising a polyester container or base tray, a peelable film coupled to the container or tray to form a receiving space therebetween, and an adhesive layer to adhere the film to the container or tray, wherein the adhesive layer comprises a copolyester blend comprising
- A) 45-65 wt % of at least one copolyester composition comprising:
- (a) a dicarboxylic acid component comprising:
- (i) 85 to 100 mole % of terephthalic acid residues, and
- (ii) 0 to 15 mole % of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms;
- and
- (b) a glycol component comprising:
- (i) 1 to 10 mole % of one or more of 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) residues;
- 1,4-cyclohexanedimethanol (CHDM) residues;
- NPG residues, and DEG residues, whether or not formed in situ, and
- (ii) 90-99 mole % of ethylene glycol (EG) residues;
- and
- wherein the total mole % of the dicarboxylic acid component is 100 mole %, and
- wherein the total mole % of the glycol component is 100 mole %;
- and
- B) 35-55 wt % of at least one copolyester composition comprising
- (a) a dicarboxylic acid component comprising:
- (i) 85 to 100 mole % of terephthalic acid residues, and
- (ii) 0 to 15 mole % of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms;
- and
- (b) a glycol component comprising:
- (i) 20 to 50 mole % DEG residues;
- and
- (ii) 50-80 mole % of ethylene glycol (EG) residues, and
- wherein the total mole % of the dicarboxylic acid component is 100 mole %, and
- wherein the total mole % of the glycol component is 100 mole %;
- and
- wherein the copolyester blend has a melting temperature (Tm) of 225-255° C.;
- and
- wherein the Tg of the copolyester blend is from 60-75° C.;
- and
- wherein the inherent viscosity of the copolyester blend is from 0.60 to 0.90 dL/g;
- and wherein the adhesive composition provides a peel force of 2-12N.
Dependencies are inferred from the claim text.