High impact polystyrene flame retarded compositions
AssigneeBromine Compounds Ltd.
InventorsYoav Bar-Yaakov, Yaniv Hirschsohn, Ita Finberg
Life of this patent
Estimating the term…
Abstract
The invention relates to a polymer composition comprising high impact polystyrene (HIPS) and a combination of flame retardants which are brominated epoxy oligomers and polymers. A process for preparing the HIPS composition through a masterbatch route and a masterbatch composition which contains the flame retardants are also disclosed.
Claims16
A flame-retarded polymeric composition comprising high impact polystyrene (HIPS) and a combination of flame retardants of Formula (1):
- wherein m indicates the degree of polymerization and R1 and R2 are independently selected from the group consisting of
- wherein said combination of flame retardants of Formula (1) comprises:
- (i) at least one high molecular weight brominated epoxy polymer (HMW-BE) of Formula (1a):
- wherein m, the average degree of polymerization, is between 49 and 135, and said at least one HMW-BE having a weight-average molecular weight between 40,000 and 60,000, or an end-capped derivative thereof;
- and
- (ii) at least one low molecular weight brominated epoxy oligomer (LMW-BE) with number-average molecular weight between 670 and 2500, or at least one intermediate molecular weight brominated epoxy polymer (IMW-BE) with weight-average molecular weight between 5000 and 30000;
- or an end-capped derivative thereof;
- and wherein the HMW-BE is the predominant component in said combination of flame retardants.
A masterbatch composition which consists essentially of a combination of brominated flame retardants, said combination comprising:
- (i) high molecular weight brominated epoxy polymer (HMW-BE) of Formula (1a):
- having weight-average molecular weight of about 40000 to 60000;
- and
- (ii) low molecular weight brominated epoxy oligomer (LMW-BE) of Formula (1a):
- having number-average molecular weight of about 800 to 1300, wherein the total concentration of said HMW-BE and LMW-BE is not less than 91% relative to the weight of the masterbatch wherein said masterbatch further comprises an anti-dripping agent and a processing modifier.
Dependencies are inferred from the claim text.