Pvc foam processing aid, method for preparing the same and polyvinyl chloride resin composition comprising the same

Patent metadata

Field	Value
Publication number	US-2016333176-A1
Application number	US-201314353975-A
Country	US
Kind code	A1
Filing date	Dec 18, 2013
Priority date	Feb 28, 2013
Publication date	Nov 17, 2016
Grant date	—

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.

First claim

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.

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.

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.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Yoon Ho
• Kim Geon-Soo
• Lee Kwang Jin

Classifications

• C08J2433/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08G2101/00

  Manufacture of cellular products · CPC title

• C08J2433/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08L25/12 Primary

  with unsaturated nitriles · CPC title

• C08J2201/03

  Extrusion of the foamable blend · CPC title