摘要:
A method for formulating an aqueous dispersion of a polymer includes dissolving a polymer such as an acrylic polyol in a solvent to form a polymer solution. A surfactant is added to the polymer solution, and water is then added with mixing sufficient to dispersed the polymer in the water. The resulting aqueous dispersion can be mixed with a water dispersible polyisocyanate to produce coating materials which can be cured to form tough films and coatings.
摘要:
There is disclosed a self-dispersing curable epoxy resin composition comprising the addition product of reactants comprising (a) 1.0 reactive equivalent of an epoxy resin, (b) from about 0.40 to 0.95 reactive equivalents of a polyhydric phenol, and (c) from about 0.005 to 0.5 reactive equivalents of an amine-epoxy adduct comprising the addition product of reactants comprising 1.0 reactive equivalent of a polyepoxide and from about 0.3 to 0.9 reactive equivalents of a polyoxyalkyleneamine with the structural formulaH.sub.2 N--CH(R.sub.2)CH.sub.2 --O--R.sub.1 --CH.sub.2 CH(R.sub.2)--NH.sub.2wherein:R.sub.1 represents a polyoxyalkylene chain having the structural formula:(CH.sub.2 --CH.sub.2 --O).sub.a --(CH.sub.2 --CH(R.sub.3)--O).sub.bwherein:R.sub.3 is a monovalent organic radical selected from the group consisting of C.sub.1 to C.sub.4 aliphatic hydrocarbons,`a` designates a number of ethoxy groups (CH.sub.2 --CH.sub.2 --O),`b` designates a number of monosubstituted ethoxy groups (CH.sub.2 --CH(R.sub.3)O), the sum of `a` and `b` is equal to or greater than 10 but less than or equal to 300, and where the ratio of `a` to `b` is between 1:0 and 1:1. For any values of `a` and `b` the sequence of ethoxy and monosubstituted ethoxy groups within a polyoxyalkylene chain may be completely random and/or there may be blocks of ethoxy and/or monosubstituted ethoxy groups.R.sub.2 designates hydrogen or a monovalent organic radical selected from the group consisting of C.sub.1 to C.sub.4 aliphatic hydrocarbons.
摘要:
Polythiols prepared by the reaction of hydrogen sulfide or organic dithiols with polyglycidyl substituted amines have been found to be outstanding curing agents for epoxy resins. Epoxy resins cured with these polythiols are characterized by not only improved gel times, but also improved cure rates, better heat resistance and greater resistance to absorption of water.A useful polythiol is the reaction product of N,N,N',N'-tetraglycidyl-m-xylylenediamine with hydrogen sulfide.
摘要:
There is disclosed a self-disbursing curable epoxy resin composition comprising the addition product of reactants comprising (a) 1.0 reactive equivalent of an epoxy resin, (b) from about 0.40 to 0.95 reactive equivalents of a polyhydric phenol, and (c) from about 0.005 to 0.5 reactive equivalents of an amine-epoxy adduct comprising the addition product of reactants comprising 1.0 reactive equivalent of an aromatic polyepoxide and from about 0.3 to 0.9 reactive equivalents of a polyoxyalkyleneamine.
摘要:
A process for fixing dyes impregnated in fine-dimensional synthetic textile substrates in an environmentally safe manner. The process comprises contacting the dyed synthetic substrates with a phenol- and formaldehyde-free dye-fixative composition comprising: (a) polymethacrylic acid, (b) copolymers of methacrylic acid consisting essentially of methacrylic acid and an ethylenically unsaturated comonomer selected from the group consisting of 2-acrylamido-2-methyl-propanesulfonic acid, sodium vinyl sulfonate, sodium styrene sulfonate, alkyl acrylate, and combinations thereof, (c) combinations of (a) and (b), and (d) water.
摘要:
Aqueous carbonaceous slurries having reduced viscosity, a stabilized network of carbonaceous material in water and improved pumpability are obtained by having present as a dispersant one or more particular water soluble sulfomethylated hydroxy aromatic products. Examples of dispersants are the water soluble sulfomethylation product of the water soluble residue obtained from resorcinol production by the alkaline fusion method, sulfomethylated phenol and sulfomethylated bisphenol A.
摘要:
A superplasticizer with improved water reducing properties for cement, cement slurries, mortar, grout and concrete is Penacolite Resin RM-441 as is or sulfonated, sulfomethylated, sulfonated and condensed with formaldehyde, sulfomethylated and condensed with formaldehyde, condensed with formaldehyde, co-condensed with ligninsulfonates and formaldehyde or co-condensed with naphthalenesulfonic acid formaldehyde condensate and formaldehyde. These materials can be used alone or in combination with salts of aromatic sulfonic acid formaldehyde condensates.
摘要:
A process for fixing dyes impregnated in fine-dimensional synthetic textile substrates in an environmentally safe manner. The process comprises contacting the dyed synthetic substrates with an aqueous solution of a phenol- and formaldehyde-free dye-fixative composition containing a copolymer ofa) 1.0 to about 20 percent by weight of vinyl sulfonic acid residues;b) 5 to 20 percent by weight of nonpolar or hydrophobic monomer residues; andc) 60 to about 94 percent by weight of hydrophilic ethylenically unsaturated carboxylic acid residues, the copolymers having a weight average molecular weight of from about 1,500 to about 15,000. The contacting step is for a time sufficient so that the dye-fixative composition is absorbed by the fabric.
摘要:
Superplasticizers for cementitious compositions are produced from a raw material mixture of (1) naphthalenesulfonic acid formaldehyde condensate and (2) free sulfuric acid using a 1-step process or a 2-step process. In the 1-step process, the mixture is neutralized with a zinc compound such as zinc oxide to a pH of about 2 to obtain a superplasticizer mixture of the free acid of the naphthalenesulfonic acid formaldehyde condensate and zinc sulfate. In the 2-step process, the mixture is first neutralized with a zinc compound such as zinc oxide to a pH of about 2 and then with a base such as sodium hydroxide to a pH of about 6 to obtain a superplasticizer mixture of the sodium salt of the naphthalenesulfonic acid formaldehyde condensate and zinc sulfate. These superplasticizer mixtures are superior to a low salt content commercial sodium salt of a naphthalenesulfonic acid formaldehyde condensate where sodium sulfate content has been reduced by lime treatment.
摘要:
A process for making a self-dispersible, radiation curable coating composition involving: (a) providing a cationic oligomer; (b) providing an epoxy functional monomer; (c) providing a surfactant component; (d) providing a transfer agent; (e) providing a photoinitiator; and (f) mixing (a)-(e) to form the coating composition.