Polymerization process
AssigneeLabofina, S.A.
InventorsWilliam J. I. Bracke, Jacqueline Brandli
Life of this patent
Estimating the term…
Abstract
Disclosed is a process for the production of ABS resins comprising the steps of (a) imbibing a stabilized latex of a rubbery polymer with styrene in an amount of about 1.5 and 15 parts by weight per 100 parts of dry latex and with acrylonitrile in an amount of about 5 to 15 parts by weight per 100 parts of dry latex; (b) introducing the imbibed latex into a polymerization vessel; (c) introducing into the polymerization vessel a mixture of styrene, acrylonitrile and a free radical initiator; (d) introducing a polymerization activator into the polymerization vessel; (e) polymerization the styrene and acrylonitrile in the polymerization vessel in the presence of the latex, whereby an ABS graft copolymer is produced; and (f) withdrawing the ABS polymer from the polymerization vessel.
Claims9
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.
Dependencies are inferred from the claim text.