PVC FOAM PROCESSING AID, METHOD FOR PREPARING THE SAME AND POLYVINYL CHLORIDE RESIN COMPOSITION COMPRISING THE SAME

• US 20160333176A1
• Filed: 12/18/2013
• Published: 11/17/2016
• Est. Priority Date: 02/28/2013
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Lee, Kwang Jin, Kim, Yoon Ho, Kim, Geon-soo
• Granted Patent: US 9,670,349 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C08F 212/10 with nitriles
• CPC Class Codes: C08F 220/14 Methyl esters , e.g. methyl (meth)acrylate
• CPC Class Codes: C08F 220/18 with acrylic or methacrylic acids
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 257/00 Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
• CPC Class Codes: C08G 2101/00 Manufacture of cellular products
• CPC Class Codes: C08G 2150/60 Compositions for foaming; Foamed or intumescent coatings
• CPC Class Codes: C08J 2201/03 Extrusion of the foamable blend
• CPC Class Codes: C08J 2203/04 N2 releasing, ex azodicarbonamide or nitroso compound
• CPC Class Codes: C08J 2327/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08J 2425/12 with unsaturated nitriles
• CPC Class Codes: C08J 2433/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08J 2433/10 Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: C08J 9/0061 characterized by the use of several polymeric components
• CPC Class Codes: C08J 9/103 Azodicarbonamide
• CPC Class Codes: C08L 25/12 with unsaturated nitriles
• CPC Class Codes: C08L 27/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08L 33/12 Homopolymers or copolymers of methyl methacrylate
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence

Abstract

Disclosed are a PVC foam processing aid, a method for preparing the same, and a polyvinyl chloride resin composition comprising the same. More specifically, provided are a PVC foam processing aid and a polyvinyl chloride resin composition exhibiting superior aggregation property and improving foam moldability of polyvinyl chloride (PVC) resins, prepared therefrom.

Claims

1. A PVC foam processing aid comprising:

50 to 90% by weight of a styrene-acrylonitrile copolymer; and

50 to 10% by weight of an alkyl methacrylate-alkyl acrylate copolymer,

wherein the styrene-acrylonitrile copolymer has a weight average molecular weight (Mw) of 2,000,000 to 5,000,000 g/mol, and the alkyl methacrylate-alkyl acrylate copolymer has a weight average molecular weight (Mw) of 200,000 to 1,000,000 g/mol.

2. The PVC foam processing aid according to claim 1, wherein the styrene-acrylonitrile copolymer comprises a styrene monomer and an acrylonitrile monomer at a weight ratio of 50 to 80:

50 to 20.

3. The PVC foam processing aid according to claim 1, wherein the styrene-acrylonitrile copolymer is obtained by polymerizing the styrene and acrylonitrile monomers with an alkyl methacrylate monomer.

4. The PVC foam processing aid according to claim 3, wherein the styrene-acrylonitrile copolymer comprises 50 to 70% by weight of the styrene monomer, 15 to 25% by weight of the acrylonitrile monomer and 15 to 25% by weight of the alkyl methacrylate monomer, based on 100% by weight in total of monomers constituting the styrene-acrylonitrile copolymer and is obtained by polymerizing the contents of the monomers.

5. The PVC foam processing aid according to claim 1, wherein the alkyl methacrylate-alkyl acrylate copolymer comprises 60 to 90% by weight of the alkyl methacrylate monomer and 10 to 40% by weight of the alkyl acrylate monomer, based on 100% by weight in total of the alkyl methacrylate-alkyl acrylate copolymer and is obtained by polymerizing the contents of the monomers.

6. The PVC foam processing aid according to claim 5, wherein the alkyl acrylate monomer comprises at least one selected from the group consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate, lauryl acrylate, stearyl acrylate, 2-ethylhexyl acrylate, and cyclohexyl acrylate.

7. The PVC foam processing aid according to claim 3, wherein the alkyl methacrylate monomer comprises at least one selected from the group consisting of methyl methacrylate, n-butyl methacrylate, lauryl methacrylate, stearyl methacrylate, tridecyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate and cyclohexyl methacrylate.

8. The PVC foam processing aid according to claim 2, wherein the styrene monomer comprises at least one selected from the group consisting of styrene, α

-methyl styrene, t-butyl styrene, chlorostyrene, and p-methyl styrene.

9. The PVC foam processing aid according to claim 2, wherein the acrylonitrile monomer comprises at least one selected from the group consisting of acrylonitrile, methacrylonitrile, fumaronitrile, α

-chloronitrile, and α

-cyanoethyl acrylonitrile.

10. The PVC foam processing aid according to claim 1, wherein the alkyl methacrylate-alkyl acrylate copolymer is a copolymer surrounding the styrene-acrylonitrile copolymer.

14. A polyvinyl chloride resin composition comprising:

a polyvinyl chloride resin; and

the PVC foam processing aid according to claim 1.

15. The polyvinyl chloride resin composition according to claim 14, wherein the composition comprises 100 parts by weight of the polyvinyl chloride resin and 1 to 20 parts by weight of the PVC foam processing aid.

16. The PVC foam processing aid according to claim 5, wherein the alkyl methacrylate monomer comprises at least one selected from the group consisting of methyl methacrylate, n-butyl methacrylate, lauryl methacrylate, stearyl methacrylate, tridecyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate and cyclohexyl methacrylate.

17. The PVC foam processing aid according to claim 3, wherein the styrene monomer comprises at least one selected from the group consisting of styrene, α

-methyl styrene, t-butyl styrene, chlorostyrene, and p-methyl styrene.

18. The PVC foam processing aid according to claim 4, wherein the styrene monomer comprises at least one selected from the group consisting of styrene, α

-methyl styrene, t-butyl styrene, chlorostyrene, and p-methyl styrene.

19. The PVC foam processing aid according to claim 3, wherein the acrylonitrile monomer comprises at least one selected from the group consisting of acrylonitrile, methacrylonitrile, fumaronitrile, α

-chloronitrile, and α

-cyanoethyl acrylonitrile.

20. The PVC foam processing aid according to claim 4, wherein the acrylonitrile monomer comprises at least one selected from the group consisting of acrylonitrile, methacrylonitrile, fumaronitrile, α

-chloronitrile, and α

-cyanoethyl acrylonitrile.

11. A method for preparing a PVC foam processing aid comprising:

polymerizing a styrene monomer with an acrylonitrile monomer in the presence of a polymerization initiator to obtain a styrene-acrylonitrile copolymer having a weight average molecular weight (Mw) of 2,000,000 to 5,000,000 g/mol; and

adding 7.5 to 40% by weight of an alkyl methacrylate monomer and 2.5 to 10% by weight of an alkyl acrylate monomer to 50 to 90% by weight of the styrene-acrylonitrile copolymer and performing polymerization in the presence of a polymerization initiator to obtain a polymer having a structure in which an alkyl methacrylate-alkyl acrylate copolymer having a weight average molecular weight (Mw) of 200,000 to 1,000,000 g/mol surrounds the styrene-acrylonitrile copolymer.

12. The method according to claim 11, wherein the polymerizing the styrene monomer with the acrylonitrile monomer comprises polymerizing 50 to 70% by weight of the styrene monomer, 15 to 25% by weight of the acrylonitrile monomer and 15 to 25% by weight of the alkyl methacrylate monomer, based on 100% by weight in total of the styrene-acrylonitrile copolymer.

13. The method according to claim 11, further comprising aggregating the polymer to obtain a powder.