摘要:
Otefin/mateic acid copolymer is refined to pharmaceutical quality by use of dichloroethane to remove contaminants, as by precipitating from solution with dichloroethane.
摘要:
A method is provided for controlling the para:ortho isomer distribution in nitrochlorobenzene product mixtures by the vapor phase nitration of chlorobenzene in the presence of a molecular sieve catalyst having a relatively small pore size ranging from about 5 A to about 10 A.
摘要:
Polymers comprising a plurality of adjacent activated unsaturations and which are hydrophilic are particularly useful as wet and dry strength improvers for cellulosic substrates.
摘要:
An abrasion resistant coating composition is disclosed which comprises a polyvinyl acetal having an hydroxyl group content, calculated as polyvinyl alcohol, of from 35 to 50 percent by weight and silicic acid, the weight ratio of silicic acid to polyvinyl acetal being from 2:1 to 4:1.