Extrudable thermoplastic particulates

• US 5,236,649 A
• Filed: 09/16/1991
• Issued: 08/17/1993
• Est. Priority Date: 12/23/1988
• Status: Expired due to Fees

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: Hall, Mark J., Jenkins, Steven R., Foye, Duane F., Kirkpatrick, Donald E., Stevenson, James A., Betso, Stephen R., Hyun, Kun S., Louks, Paul T.
• Primary Examiner(s): Thurlow, Jeffery
• Application Number:
  US07/760,548
• Time in Patent Office: 701 Days
• Field of Search: 264/171, 264/211, 264/130, 264/131, 264/331.15, 264/328.17, 264/210.6, 264/140-144, 264/300, 427/222, 428/378, 428/403, 428/407, 526/343, 524/568, 525/239, 156/244.24
• US Class Current: 264/130
• CPC Class Codes: B29B 13/045 of powders or pellets
• CPC Class Codes: B29B 2009/163 Coating, i.e. applying a layer of liquid or solid material on the granule
• CPC Class Codes: B29B 9/08 by agglomerating smaller particles
• CPC Class Codes: B29B 9/12 characterised by structure or composition
• CPC Class Codes: B29B 9/16 Auxiliary treatment of granules
• CPC Class Codes: B29K 2027/00 Use of polyvinylhalogenides or derivatives thereof as moulding material
• CPC Class Codes: B29K 2027/08 PVDC, i.e. polyvinylidene chloride
• CPC Class Codes: C08J 2327/08 Homopolymers or copolymers of vinylidene chloride
• CPC Class Codes: C08J 3/203 Solid polymers with solid and/or liquid additives
• CPC Class Codes: Y10S 264/905 having plural, distinct differential fluid pressure shaping steps
• CPC Class Codes: Y10T 428/2938 Coating on discrete and individual rods, strands or filaments
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer

Abstract

The present invention is a coated particulate in the form of a powder or in the form of a pellet, the particulate comprising a vinylidene chloride interpolymer and being coated with at least one processing aid at a level effective to improve the extrudability of the vinylidene chloride interpolymer. The processing aid beneficially is selected from the group consisting of fatty esters; wax esters; glycerol esters; glycol esters; fatty alcohol esters, fatty alcohols; fatty amides; metallic salts of fatty acids; olefin polymers and polyolefin waxes.

Claims

1. A coated particulate, in the form of a powder or in the form of a pellet, of extrudable thermoplastic material, the particulate comprising vinylidene chloride interpolymer, and being coated with at least one processing aid at a level effective to improve the extrudability of the vinylidene chloride interpolymer, said processing aid being selected from the group consisting of fatty esters, wax esters, glycerol esters, glycol esters, fatty alcohol esters, fatty alcohols, fatty amides, metallic salts of fatty acids, olefin polymers and polyolefin waxes.

2. The particulate of claim 1, comprising a vinylidene chloride interpolymer which is formed from a monomer mixture which comprises vinylidene chloride monomer in an amount of from about 60 to about 99 weight percent and at least one ethylenically unsaturated comonomer copolymerizable therewith in an amount of from about 40 to about 1 weight percent, said weight percents being based on the total weight of the monomer mixture.

3. The particulate of claim 2 wherein the monomer or monomers copolymerizable with the vinylidene chloride are selected from the group consisting of vinyl chloride, alkyl acrylates, alkyl methacrylates, acrylic acid, methacrylic acid, itaconic acid, acrylonitrile, and methacrylonitrile.

4. The particulate of claim 1, wherein the processing aid is coated on the vinylidene chloride interpolymer surface at a level of between about 0.001 and about 2 weight percent, based on the total weight of the particle.

5. The particulate of claim 4, wherein the processing aid is coated on the vinylidene chloride interpolymer surface at a level of between about 0.01 and about 1.5 weight percent, based on the total weight of the particulate.

6. The particulate of claim 5, wherein the processing aid is coated on the vinylidene chloride interpolymer surface at a level of between about 0.1 and about 0.7 weight percent, based on the total weight of the particle.

7. The particulate of claim 1, wherein the metallic salts of fatty acids are selected from the group consisting of calcium stearate, magnesium stearate, sodium stearate, and sodium lauryl sulfate.

8. The particulate of claim 1, wherein the olefin polymer is selected from the group consisting of polymers of α

-monoolefins and substituted α

-monoolefins.

9. The particulate of claim 8 wherein the α

-monoolefins polymers include polyethylene, polypropylene, poly(butene-1), poly(isobutylene), poly(1-pentene), poly(1-hexene), and poly(1-octene).

10. The particulate of claim 1, wherein the polyolefin wax is selected from the group consisting of paraffin waxes, nonoxidized polyethylene waxes, and oxidized polyethylene waxes.

11. The particulate of claim 1, wherein the vinylidene chloride interpolymer surface is coated with sodium lauryl sulfate and magnesium stearate.

15. The coated particulate of claim 1 wherein the processing aid is fused on the vinylidene chloride interpolymer surface.

12. A coated particulate, in the form of a powder or in the form of a pellet, of extrudable thermoplastic material, the particulate comprising vinylidene chloride interpolymer, and being coated with at least one processing aid, wherein the vinyldene chloride interpolymer is formed from a monomer mixture which comprises vinylidene chloride monomer in an amount of from about 60 to about 99 weight percent and at least one ethylenically unsaturated comonomer coplymerizable therewith in an amount of from about 40 to about 1 weight percent, said weight percents being based on the total weight of the monomer mixture, and the processing aid is selected from the group consisting of, fatty esters, wax esters, glycerol esters, glycol esters, fatty alcohol esters, fatty alcohols, fatty amides, metallic salts of fatty acids, olefin polymers and polyolefin waxes, at a level of between about 0.1 and about 0.7 weight percent, based on the total weight of the particulate.

13. An improved process for making a fabricated article, said process comprising

(1) providing a coated particulate, in the form of a powder or in the form of a pellet, of extrudable thermoplastic material, the particulate comprising vinylidene chloride interpolymer, and being coated with at least one processing aid selected from the group consisting of fatty esters, wax esters, glycerol esters, glycol esters, fatty alcohol esters, fatty alcohols, fatty amides, metallic salts of fatty acids, olefin polymers and polyolefin waxes, at a level effective to improve the extrudability of the vinylidene chloride interpolymer;

and

(2) fabricating the particulate into an article using a method selected from the group consisting of feedblock coextrusion, multimanifold die coextrusion;

injection molding;

extrusion molding; and

lamination techniques, or combinations thereof.

14. An improved process for making a fabricated article, said process comprising the following steps:

(1) providing a coated particulate, in the form of a powder or in the form of a pellet, of extrudable thermoplastic material, the particulate comprising vinylidene chloride interpolymer, and being coated with at least one processing aid, wherein the vinylidene chloride interpolymer is formed from a monomer mixture which comprises vinylidene chloride monomer in an amount of from about 60 to about 99 weight percent and at least one ethylenically unsaturated comonomer copolymerizable therewith in an amount of from about 40 to about 1 weight percent, said weight percents being based on the total weight of the monomer mixture, and the processing aid is selected from the group consisting of, fatty esters, wax esters, glycerol esters, glycol esters, fatty alcohol esters, fatty alcohols, fatty amides, metallic salts of fatty acids, olefin polymers and polyolefin waxes;

at a level of between about 0.1 and about 0.7 weight percent, based on the total weight of the pellet; and

(2) fabricating the particulate into an article using a method selected from the group consisting of feedblock coextrusion, multimanifold die coextrusion;

injection molding;

extrusion molding; and

lamination techniques, or combinations thereof.