Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1980-10-01
1981-11-24
Hamrock, William F.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525272, 525314, 526174, 526181, C08F 448
Patent
active
043025595
ABSTRACT:
Copolymers of alpha-methylstyrene-type monomers and conjugated diene monomers are prepared by polymerizing an alpha-methylstyrene monomer using a first polar activator, adding a small amount of a conjugated diene monomer to cap the block of alpha-methylstyrene-type monomer polymer, and further adding a conjugated diene monomer and polymerizing with a second polar activator effective for copolymerization of residual alpha-methylstyrene-type monomer. The resulting copolymer can be coupled to form linear or radial block copolymers.
REFERENCES:
patent: 2975160 (1961-03-01), Belinski
patent: 3265765 (1966-08-01), Holden et al.
patent: 3331826 (1967-07-01), Talcott
patent: 3366611 (1968-01-01), Wofford
patent: 3431323 (1969-03-01), Jones
patent: 3459700 (1969-08-01), Richards
patent: 3496154 (1970-02-01), Wofford
patent: 3825623 (1974-02-01), LaFlair
patent: 3912793 (1975-10-01), Hoviie et al.
Whitby-Synthetic Rubber, pp. 746-747 (Wiley), 1954.
Karoly, "An Alpha-Methylstyrene Isoprene Block Copolymer", Div. Poly Chem., Poly. Reprints, vol. 10, #2, pp. 837-842.
Hamrock William F.
Phillips Petroleum Co.
LandOfFree
Conversion of alpha-methylstyrene-type monomers in the formation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Conversion of alpha-methylstyrene-type monomers in the formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Conversion of alpha-methylstyrene-type monomers in the formation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2175537