摘要:
A specific class of anionic ion-exchange membranes, comprising a crosslinked vinyl imidazole polymer or copolymer film, is suitable for use in electrodialysis process by use of ion-exchange membranes of an aqueous solution containing organic contaminating electrolyte such as humic acid without organic contamination.
摘要:
Modified vinyl chloride polymers, having elevated heat deflection temperatures, are provided by the post-chlorination of vinyl chloride-propylene copolymers.
摘要:
Acrylonitrile polymers of improved whiteness and thermal stability are provided by polymerizing acrylonitrile alone or with a comonomer in an aqueous medium, in the presence of a water-insoluble mercaptan, together with a redox catalyst comprising sulfurous acid or a salt thereof and nitrous acid or a salt thereof.
摘要:
Water soluble dialkylaminoethyl vinyl ether interpolymers of the formula
AND SALTS THEREOF WHEREIN R1 and R2 are each selected from the group consisting of methyl, ethyl, or hydroxyethyl or taken together with the N atom to which they are attached a heterocyclic ring, X and Y are selected from vinyl monomers copolymerizable with said other monomers and wherein the proportions of a, b, c and d of said monomer units in said interpolymer calculated on the basis of weight percent of the interpolymer amount to 80-10 weight percent of a, 70-10 weight percent of b, 30-0 weight percent of c, and 20-0 weight percent of d. The interpolymers of the invention are useful as flocculants and retention aids.
摘要:
An alcohol-soluble and/or water-soluble, printing ink composition comprising, as a vehicle, a resinous varnish composed mainly of a resin having an acid number of at least 180 and prepared by reacting dicyclopentadiene or methyldicyclopentadiene with an unsaturated dibasic acid anhydride.
摘要:
Branched copolymers of ethylene with unsaturated silicone monomers, useful as water-repellent coatings, having the general formula R1CH CHSiRm2Rn3(OR4)p, wherein R1 is H or an aliphatic radical having the number of carbon atoms from 1 to 3; R2 is a saturated aliphatic radical with from 1 to 4 carbon atoms; R3 is phenyl; R4 is a saturated aliphatic radical having from 1 to 10 carbon atoms or an aryl having no more than 2 aromatic rings; m is from 0 to 2, when R1 H, and from 1 to 3, when R1 is a saturated aliphatic radical; n is from 0 to 3; p is from 0 to 2; and m + n + p 3; can be prepared by copolymerization of ethylene with unsaturated silicone monomers of the above formula, wherein the reaction mixture contains from 0.5 to 85 molar per cent of the silicone monomer, at pressures from 150 to 3500 atm and temperatures of from 40* to 300* C in the presence of freeradical polymerization.
摘要:
Vinyl acetate/ethylene copolymer powders are obtained by spraydrying of the corresponding aqueous polymer dispersions while simultaneously adding finely divided inorganic materials as anticaking agents. The polymer powders thus obtained have an excellent storage stability, are easily dispersible in water and yield plastics mortars of high water resistance and plasterings made therefrom which are free from cracks.
摘要:
WHEREIN M IS AN INTEGER FROM 2 TO 5 AND N IS AN INTEGER FROM 2 TO 10. The sulfonyl-containing fluorocarbon vinyl ethers are prepared by monoaddition of sulfuryl fluoride to divinyl ethers in the presence of fluoride ions with the formed ethers useful in preparation of ion exchange polymers.
Sulfonyl-containing fluorocarbon vinyl ethers are disclosed of the formula
摘要:
A two-step process involving bulk polymerization of a mixture of hydrophobic and hydrophilic monomers followed by emulsion polymerization conveniently yields a stable copolymer latex composition having improved properties. The process is particularly useful for preparing carboxylated styrene-butadiene latex compositions.
摘要:
An acrylic fiber made from a composition comprising acrylonitrile and an epoxide-containing vinyl monomer is herein described wherein the epoxide portion of said monomer is pendant to the polymer chain and thereafter reacted with a polyhydroxyl compound to produce an improved filamentary material. The fiber is made from a polymer which is made by forming an epoxide containing polymer of acrylonitrile and allowing the polymer to undergo an acid catalyzed reaction in a spin bath containing a polyhydroxyl compound such as polyethylene glycol. The novel compositions herein described have enhanced properties.