The B. F. Goodrich Company

Lubrizol Advanced Materials, Inc.

Pmd Group Inc.

Vic Stanislawczyk

Alexander V Lubnin

Shui-Jen Raymond Hsu

Douglas E Skillicorn

Dennis N Malaba

Roman W Wypart

Miles B Dearth

Gary D Calhoun

Gary L Julian

Darlene D Rota

Stephan A Horvath

Ioan Marcu

John E Fitzwater

Michael W Topp

Mark W Wolfinger

William Fish

Leander H Bauer

Tamela A Morgan

This invention relates to a heat sealable adhesive composition for packaging for moderate to high moisture food products. The adhesive comprises latex in water with a minimum film formation temperature near or below 25&#xb0; C. and an ethylene-vinyl acetate copolymer dispersion in water, blocking resistance up to 50&#xb0; C., heat seal-ability under reasonable conditions of contact time, temperature and pressure, good adhesive properties, and approval for food contact.

Waterborne polymers for heat seal adhesive

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.

Coating composition

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', &#x201c;ice-cream cone&#x201d; 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.

Water dispersions of non-uniform polyurethane particles

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', &#x201c;ice-cream cone&#x201d; 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.

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.

Latex with isocyanate crosslinker as binder for fibrous substrates

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&mdash;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.

Multiple phase polymeric vinyl chloride systems and related core-shell particles

An emulsion polymer comprising as one of its components a graft copolymer of a residual aromatic monomer-free support resin polymer and a vinyl chloride (co)polymer is disclosed. The emulsion polymer is prepared using a two-stage process. In the first stage, a chasing monomer is reacted in the presence of a support resin polymer having at least one aromatic monomer to form an polymer which is free of residual monomer and has monomeric units derived from the aromatic monomer(s). In a second stage, the vinyl chloride emulsion (co)polymer is made in situ in a reaction mixture comprising the polymer which is free of residual monomer. An extensive grafting at the second stage yields a novel water dispersible graft copolymer containing both styrene and vinyl chloride.

Supported vinyl chloride emulsion (co) polymers and process for making

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.

Vinylidene chloride emulsion interpolymer composition

Thermoplastic elastomer resins are described which comprise vinyl halide grafted to crosslinked acrylic latex particles comprising predominantly acrylate-containing, crosslinked polymer chains derived from

Thermoplastic elastomers comprising vinyl halide grafted to crosslinked

A novel latex 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;

Rubbery carboxylated acrylate polymer, latex, and preparation thereof

A novel latex 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 alkoxyalkyl, C.sub.2 -C.sub.7 alkylthioalkyl, or C.sub.2 -C.sub.7 cyanoalkyl; and at 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 latex can only be formed in an aqueous medium 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 highly stable latex of polymer particles having a glass transition temperature (T.sub.g) in the range from about -20.degree. C. to about -60.degree. C., and having on their surfaces, a concentration of carboxyl (COOH) groups which is at least twice that of COOH groups on particles of a latex formed by conventionally proportioning the monomer ingredients after initiation. The unique distribution of COOH groups permits the latex to be sprayed, for example on a non-woven fabric, without plugging the nozzle of a commercial spray gun, and imparts unexpectedly high blocking resistance to the non-woven. The unique characteristic concentration of carboxyl groups persists in an elastomeric film obtained by removing volatiles from the coalesced polymer particles. A self-supporting film is soft, but tough, with a raw tensile strength of at least 300 psi, at elongation of at least 350%, and exhibits less than 20% hysteresis loss.

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;

Nonwoven fabric coated with carboxylated acrylate polymers, and process

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;

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Strongsville, OH, United States of America

Vic Stanislawczyk