Patent ID: 8524856

Claim:
A method of preparing a branched polymer composition, comprising reacting a PHA comprising a poly(3-hydroxybutyrate-co-4-hydroxybutyrate) copolymer and PBS, PBSA or combinations with a branching agent, thereby forming a branched polymer composition of PHA and PBS, a branched polymer of PHA and PBSA or a branched polymer Of PHA, PBS, and PBSA; wherein the branching agent is selected from: dicumyl peroxide, t-amyl-2-ethylhexyl peroxycarbonate, 1,1-bis (t-butylperoxy)-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-bis(t-butylperoxy)-2,5-dimethylhexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane-3, di-t-butyl peroxide, benzoyl peroxide, di-t-amyl peroxide, t-butyl cumyl peroxide, n-butyl-4,4-bis (t-butylperoxy)valerate, 1,1-di(t-butylperoxy)-3,3,5-trimethyl-cyclohexane, 1,1-di (t-butylperoxy)cyclohexane, 1,1-di(t-amylperoxy)-cyclohexane, 2,2-di(t-butylperoxy)butane, ethyl-3,3-di(t-butylperoxy)butyrate, 2,2-di(t-amylperoxy)propane, ethyl-3,3-di(t-amylperoxy)butyrate, t-butylperoxy-acetate, t-amylperoxyacetate, t-butylperoxybenzoate, t-amylperoxybenzoate, and di-t-butyldiperoxyphthalate.