摘要:
A process for the modification of .alpha.-olefin (co)polymers to introduce branching, is disclosed. More particularly, the present invention relates to a process of branching .alpha.-olefins by contacting said .alpha.-olefins with a peroxide compound containing an activated unsaturated group at a temperature above 120.degree. C. The process may be carried out under a nitrogen atmosphere or in the melt form under an oxygen-containing atmosphere.
摘要:
A process is provided for producing a low molecular weight isoolefin polymer by contacting at conversion conditions a higher molecular weight saturated isoolefin polymer, for example, polyisobutylene or a copolymer of a C.sub.4 to C.sub.7 isoolefin and a para-alkylstyrene, in the melt phase, with an initiator, such as an oxygen-containing gas, an organic peroxide or an azo compound.
摘要:
A method for removing volatile substances from polyphenylene ether (PPE) resin blends in an extruder comprising adding a second thermoplastic resin downstream from the PPE feedport and one stage of water injection followed by vacuum venting is disclosed.
摘要:
Use of strong acidic materials, such as molecular sieves, reduces the level of t-butyl alcohol (TBA) produced during the visbreaking of polyolefins.
摘要:
The present invention relates to poly-(C.sub.2 -C.sub.10 -.alpha.-olefine)-carboxylic acids of Mw (weight average) 2000 to 350,000, to their preparation by oxidative degradation of polyolefines or by reaction of "Living" polyolefines with CO.sub.2, to their conversion into poly-(C.sub.2 -C.sub.10 -.alpha.-olefine)-carbonyl halides and to their use for preparing polyolefine/polycarbonate block copolymers and the block copolymers obtainable by the process according to the invention.
摘要:
Unstable backbone links in melt-processible tetrafluoroethylene copolymers can be reduced by subjecting the copolymer to high shear in a twin-screw extruder.