Polyester/low-viscosity polyethylene melt blends for powder adhesives or powder coating materials

• US 4,217,426 A
• Filed: 01/19/1979
• Issued: 08/12/1980
• Est. Priority Date: 11/14/1977
• Status: Expired due to Term

• Current Assignee: Eastman Chemical Company
• Original Assignee: Eastman Kodak Company
• Inventors: Weemes, Doyle A., McConnell, Richard L.
• Primary Examiner(s): Lieberman, Paul
• Application Number:
  US06/004,951
• Time in Patent Office: 571 Days
• Field of Search: 260/873, 264/178 R, 525/173, 525/174, 525/177
• US Class Current: 525/173
• CPC Class Codes: C08G 63/18 the acids or hydroxy compounds containing carbocyclic rings
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C09D 167/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C09D167/06 takes precedence
• CPC Class Codes: C09J 167/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C09J167/06 takes precedence

Abstract

Semi-crystalline polyester/low viscosity polyethylene melt blends, which are non-tacky and non-blocking and are more readily grindable by cryogenic grinding techniques, for providing powders suitable for powder adhesives particularly useful for fusible interlinings or for providing powder coating materials.

Claims

1. An improved polyester suitable for powder adhesives and powder coating materials comprising an intimate melt blend of (A) a semicrystalline polyester having an inherent viscosity ranging from about 0.4 to 1.2, a melting point of about 80°

-155°

C. and an apparent heat of fusion of ≦

10 calories per gram selected from the group consisting of copolyester containing from 100 to 60 mole percent terephthalic acid, 0 to 40 mole percent isophthalic acid, 100 to 35 mole percent 1,6-hexanediol and 0 to 65 mole percent 1,4-butanediol; and

(B) a low molecular weight polyethylene having a melt viscosity ranging from about 50 to 30,000 centipoises at 150°

C., a density at 25°

C. of about 0.90 to 0.98 and an acid number of about 0-80;

wherein said low molecular weight polyethylene is present in the blend in an amount of from about 3 to about 30% by weight.

2. The polyester powder of claim 1, wherein the copolyester contains 100 to 65 mole percent terephthalic acid, 0 to 35 mole percent isophthalic acid, 95 to 40 mole percent 1,6-hexanediol and 5 to 60 mole percent 1,4-butanediol.

3. The polyester powder of claim 1, wherein the copolyester contains 100 mole percent terephthalic acid, 80 mole percent 1,6-hexanediol and 20 mole percent 1,4-butanediol.

4. The polyester powder of claim 1, wherein the copolyester contains 80 mole percent terephthalic acid, 20 mole percent isophthalic acid, 80 mole percent 1,6-hexanediol and 20 mole percent 1,4-butanediol.

5. The polyester powder of claim 1, wherein the copolyester contains 100 mole percent terephthalic acid, 58 mole percent 1,6-hexanediol and 42 mole percent 1,4-butanediol.

6. The polyester powder of claim 1, wherein the copolyester contains 80 mole percent terephthalic acid, 20 mole percent isophthalic acid, 70 mole percent 1,6-hexanediol and 30 mole percent 1,4-butanediol.

7. The polyester powder of claim 1, wherein the copolyester contains 80 mole percent terephthalic acid, 20 mole percent isophthalic acid, 35 mole percent, 1,6-hexanediol and 65 mole percent 1,4-butanediol.

8. The polyester powder of claim 1, wherein the copolyester contains 90 mole percent terephthalic acid, 10 mole percent isophthalic acid, 80 mole percent 1,6-hexanediol and 20 mole percent 1,4-butanediol.