| 摘要 |
<p>1,145,687. Synthetic rubber latices. COPOLYMER RUBBER & CHEMICAL CORP. 8 June, 1967 [13 June, 1966; 3 Aug., 1966], No. 26414/67. Headings C3P and C3R. [Also in Division D1] Latices comprise an aqueous dispersion of a rubbery interpolymer of ethylene, at least one straight chain C 3-16 mono-olefin and at least one polyunsaturated cyclic bridged ring hydrocarbon selected from 5-alkylidene-2-norbornenes in which the alkylidene group contains 1 to 20 carbon atoms and 5-alkenyl-2-norbornenes in which the alkenyl group contains 3 to 20 carbon atoms, the mole ratio of chemically bound ethylene to chemically bound monoolefin being 80: 20 to 20: 80 and the rubbery interpolymer having a reduced specific viscosity of at least 2À2 and an effective unsaturation level of at least 5 carbon-carbon double bonds per 1000 carbon atoms. The preferred monoolefin is propylene, and specified cyclic hydrocarbons are 5-methylene-, 5-ethylidene-, 5-isopropylidene-, 5-(2- methyl-2-butenyl)-, 5-(3-methyl-2-butenyl)- and 5-(3,5 - dimethyl - 4 - hexenyl) - 2 - norbornenes. The latices may be prepared by dispersing organic solvent solutions of the interpolymers, prepared by polymerization in the presence of a "Ziegler" catalyst, in water in the presence of an emulsifier and removing the solvent by steam distillation. The latices may be mixed with alkaline solutions of phenol/aldehyde condensates, e.g. derived from phenol, resorcinol, cresols, xylenols, trimethylphenols, mono- and dichlorophenols, and formaldehyde, acetaldehyde, propionaldehyde and furfural; and with fillers such as carbon black; and applied to organic reinforcements to improve the adhesion thereof to rubbers in the manufacture of tyres, belts, air springs and hoses. Examples describe aqueous compositions comprising resorcinol/ formaldehyde condensates and interpolymers of ethylene and propylene with 5-ethylidene-2- norbornene, 5-methylene-2-norbornene and 5- (3-methyl-2-butenyl)-2-norbornene.</p> |
