摘要:
A polymeric dispersion in aqueous phase for use as a polymeric binder for paper and other nonwoven articles is described utilizing a polyisocyanate in combination with said polymeric binder to increase the ratio wet tensile/dry tensile strength. The polyisocyanate seems to be functioning by increasing the fiber to binder interaction rather than by simply increasing the strength/crosslink density of the binder. The polyisocyanate can be blocked isocyanate(s) or water dispersible isocyanate(s). The binder may or may not have isocyanate reactive species along the backbone.
摘要:
The disclosed invention relates to a coating composition, comprising: water; a multivalent transition metal oxide, hydroxide and/or salt; and a polymer comprising repeating units derived from itaconic acid. The coating composition may be used to coat masonry substrates, and the like.
摘要:
A novel method of preparing an aqueous dispersion of non-uniform polyurethane particles which comprises (a) preparing at least two isocyanate-terminated polyurethane prepolymers having different hydrophilicities; (b) preparing a uniform mixture of said prepolymers, and (c) dispersing the mixed prepolymers in an aqueous medium. The resulting dispersion of the prepolymers may optionally be chain extended. This method enables the preparation of core-shell particles as well as particles of other morphologies, including “raspberry”, interpenetrating network, “salt-and-pepper”, “ice-cream cone” and particles of gradient composition. Similarly, an aqueous dispersion of two different polyurethane polymers may be obtained by first preparing at least two different isocyanate-terminated polyurethane prepolymers, preparing a uniform mixture of such prepolymers and thereafter dispersing the mixture in an aqueous medium.
摘要:
A novel method of preparing an aqueous dispersion of non-uniform polyurethane particles which comprises (a) preparing at least two isocyanate-terminated polyurethane prepolymers having different hydrophilicities; (b) preparing a uniform mixture of said prepolymers; and (c) dispersing the mixed prepolymers in an aqueous medium. The resulting dispersion of the prepolymers may optionally be chain extended. This method enables the preparation of core-shell particles as well as particles of other morphologies, including “raspberry”, interpenetrating network, “salt-and-pepper”, “ice-cream cone” and particles of gradient composition. Similarly, an aqueous dispersion of two different polyurethane polymers may be obtained by first preparing at least two different isocyanate-terminated polyurethane prepolymers, preparing a uniform mixture of such prepolymers and thereafter dispersing the mixture in an aqueous medium.
摘要:
The disclosed invention relates to a coating composition, comprising: water; a multivalent transition metal oxide, hydroxide and/or salt; and a polymer comprising repeating units derived from itaconic acid. The coating composition may be used to coat masonry substrates, and the like.
摘要:
Fibers in non-woven fibrous goods are bonded together by a crosslinked carboxylated acrylate polymer which forms a network of coalesced latex particles bonding contiguous fibers. This network exists as a non-continuous, porous film supported upon the fibers of the non-woven goods. The particles are of polymer derived from a crosslinked carboxylate latex containing from 1-20 phr of itaconic acid (IA) and at least 70 phr of one or more copolymerizable monomers one of which is an acrylate having the structure ##STR1## wherein R.sub.1 is hydrogen or methyl;R.sub.2 represents C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.7 alkoxyalkyl, C.sub.2 -C.sub.7 alkylthioalkyl, or C.sub.2 -C.sub.7 cyanoalkyl; andat least 40 phr of said acrylate in said film is present as an alkyl acrylate in which alkyl is C.sub.4 -C.sub.8.The network can only be derived from a latex which has been formed by an emulsion polymerization process in which at least one-half of the IA is initially charged into a reactor, and the remaining ingredients of the recipe then added gradually. The unique order of addition produces a concentration of carboxyl (COOH) groups on the surface of the latex particles which is at least twice that of COOH groups on particles of a latex formed by conventionally proportioning the monomer ingredients after initiation. This distribution of COOH groups persists in the coalesced latex particles, and results in a polymer having higher tensile strength and toughness than might be expected in a polymer with such low T.sub.g in the acrylate family.
摘要:
A novel method of preparing an aqueous dispersion of non-uniform polyurethane particles which comprises (a) preparing at least two isocyanate-terminated polyurethane prepolymers having different hydrophilicities; (b) preparing a uniform mixture of said prepolymers; and (c) dispersing the mixed prepolymers in an aqueous medium. The resulting dispersion of the prepolymers may optionally be chain extended. This method enables the preparation of core-shell particles as well as particles of other morphologies, including “raspberry”, interpenetrating network, “salt-and-pepper”, “ice-cream cone” and particles of gradient composition. Similarly, an aqueous dispersion of two different polyurethane polymers may be obtained by first preparing at least two different isocyanate-terminated polyurethane prepolymers, preparing a uniform mixture of such prepolymers and thereafter dispersing the mixture in an aqueous medium.
摘要:
An emulsion or suspension polymer comprising a vinyl chloride polymeric core and an acrylic ester-acrylonitrile polymeric shell is disclosed. The emulsion polymer is preferably prepared using a two-stage process. In the first stage, a vinyl chloride monomer is polymerized or copolymerized to form a first phase of a polymeric hard core having a relatively high chlorine content. In a second stage, the soft acrylic ester—acrylonitrile copolymer is made in situ in a reaction mixture comprising the first phase. The product provides both flame retardancy and low MFFT, and is useful in a variety of coating and binding applications.
摘要:
An aqueous emulsion interpolymer composition capable of forming stable films which have excellent protective properties, especially on metallic substrates, good chemical resistance and/or permeability to water vapor, comprising particles suspended in an aqueous solution made by interpolymerizing an acrylic latex seed particle with a vinylidene chloride polymer comprising vinylidene chloride, one or more alkyl acrylates having from 1 to 18 carbon atoms in the alkyl group and/or one or more alkyl methacrylates having 1 to 18 carbon atoms in the alkyl group, one or more aliphatic alpha-beta-unsaturated carboxylic acids, and a copolymerizable surface active agent, the proportion of vinylidene chloride being 65 to 90 parts by weight, the portion of said alkyl acrylates and/or methacrylates being from 2 to 30 parts by weights, the portion of said carboxylic acids being from 0.1 to 20 parts by weight, and the portion of said copolymerizable surface active agent being from 0.1 to 5.0 parts by weight.
摘要:
A soft but tough self-supporting elastomeric film having a glass transition temperature (T.sub.g) in the range from about -20.degree. C. to about -60.degree. C., raw tensile strength of at least 300 psi, along with an elongation of at least 350% and less than 20% hysteresis loss, exhibits "snap", a characteristic of a natural rubber band. The novel film is derived from a crosslinked carboxylate latex containing from 1-20 phr of itaconic acid (IA) and at least 70 phr of one or more copolymerizable monomers one of which is an acrylate having the structure ##STR1## wherein R.sub.1 is hydrogen or methyl;R.sub.2 represents C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.7 alkylthioalkyl, or C.sub.2 -C.sub.7 cyanoalkyl; andat least 40 phr of said acrylate in said film is present as an alkyl acrylate in which alkyl is C.sub.4 -C.sub.8.The film can only be derived from a latex which has been formed by an emulsion polymerization process, in which at least one-half of the IA is initially charged into a reactor, and the remaining ingredients of the recipe then added gradually. This unique order of addition produces a concenration of carboxyl (COOH) groups on the surface of the latex particles which is at least twice that of COOH groups on particles of a latex formed by conventionally proportioning the monomer ingredients after initiation. This distribution of COOH groups persists in coalesced latex particles, and results in a film having higher tensile strength and toughness than might be expected in a film with such low T.sub.g in the acrylate family.