Claims
- 1. A process for preparing an ABS graft copolymer comprising the steps of:
- (a) imbibing a stabilized latex rubbery polymer having a surface tension of between about 30 and 40 dynes/cm with a portion of the styrene to be grafted with the latex in an amount of about 1.5 and 15 parts by weight styrene per 100 parts of dry latex and with a portion of the acrylonitrile to be grafted with the latex in an amount of about 5 to 15 parts by weight acrylonitrile per 100 parts of dry latex for a period between about 1 and 20 hours;
- (b) introducing said imbibed latex into a polymerization vessel;
- (c) introducing into said polymerization vessel the balance of styrene, and the balance of acrylonitrile and a free radical initiator;
- (d) introducing a polymerization activator into said polymerization vessel;
- (e) polymerizing said styrene and acrylonitrile in said polymerization vessel in the presence of said latex, whereby an ABS graft copolymer is produced; and
- (f) withdrawing said ABS polymer from said polymerization vessel.
- 2. The process as defined by claim 1, wherein the total styrene and acrylonitrile amounts to between about 35 and 600% by weight of said dry latex.
- 3. The process as defined by claim 1, wherein the ratio of total styrene to acrylonitrile ranges between about 4:1 to 1:1.
- 4. The process as defined by claim 1, wherein from about 0.2 to 1% by weight of a molecular weight regulator based upon the styrene and acrylonitrile is added to said polymerization vessel in step (c).
- 5. The process as defined by claim 1, wherein said styrene and acrylonitrile in step (c) are in a ratio of from about 25 to 33% by weight acrylonitrile and from about 7% to 75% by weight styrene.
- 6. The process as defined by claim 1, wherein said stabilized latex is prepared by adding to an unstabilized latex from about 2 to 10 parts by weight per 100 parts by weight of dry latex of an emulsifier selected from the group consisting of ammonium salts and alkali metal salts of a fatty acid.
- 7. The process as defined by claim 1, wherein said polymerization step is conducted at a temperature of from about 10.degree. and 75.degree. C.
- 8. The process as defined by claim 1, wherein the latex is imbibed with from about 1.75 to 10 parts of styrene and with from about 6 to 12 parts of acrylonitrile.
- 9. The process as defined by claim 4, wherein said molecular weight regulator is an alkylmercaptan containing from 8 to 16 carbon atoms per molecule.
Parent Case Info
This is a continuation of Ser. No. 676,807, filed April 14, 1976, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3855355 |
Moore |
Dec 1974 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
1373089 |
Nov 1974 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
676807 |
Apr 1976 |
|