The Dow Chemical Company

Dow Global Technolgoies LLC

Lawrence S Hood

Bharat Indu Chaudhary

Chung Poo Park

Russell P Barry

Yunwa Wilson Cheung

Martin J Guest

Johan A Thoen

John J Gathers

Rene Broos

Brian H Deshano

Mark Alan Barger

Chau Van Vo

Shari Kram

Richard T Fox

Warren H Griffin

John Gordon-Duffy

William A Heeschen

Van-Chau Vo

Roy E Smith

Kenji Matsue

David J Frankowski

Naganori Nishioka

Yoshihiro Shirakawa

Chau-Van Vo

Shari L Kram

Mark A Barger

Extruded polymer foams are made from a polymer composition that includes an unbrominated styrenic polymer, a brominated vinyl aromatic/butadiene flame retardant, and an unbrominated vinyl aromatic/butadiene polymer. The unbrominated vinyl aromatic/butadiene polymer improves the cell homogeneity.

Foamed styrenic polymers containing a brominated styrene-butadiene copolymer and having enhanced cell size homogeneity

Prepare polymeric foam articles having low yellowing using a styrene-acrylonitrile copolymer that contains less than 145 weight-parts acrylonitrile dimer and less than 8,500 weight-parts acrylonitrile trimer per million weight parts acrylonitrile copolymer.

Styrene-acrylonitrile copolymer foam with minimal yellowing

Prepare a closed-cell alkenyl aromatic polymer foam by an extrusion process using a blowing agent composition that contains at least 30 weight-percent of the chlorine-free hydrofluorocarbon blowing agent such that the foam has a density of 48 kilograms per cubic meter or less, contains more than 50 weight-percent styrene-acrylonitrile copolymer based on total polymer weight and at least eight weight-percent of a chlorine-free hydrofluorocarbon blowing agent that has a lower solubility in polystyrene than 1,1,2,2-tetrafluoroethane (HFC-134).

Alkenyl aromatic foam with low solubility hydrofluorocarbon

Prepare a polymeric foam from a foamable polymer composition containing a thermoplastic polymer composition and a blowing agent wherein 75 percent or more by weight of all non-halogenated polymers in the foamable polymer composition is a styrene-acrylonitrile copolymer composition having a polymerized acrylonitrile content distribution with a positive skew in a copolymerized AN content distribution and a positive percent difference between the mean and the median copolymerized AN content distribution.

Positive skew styrene-acrylonitrile copolymer foam

Prepare an extruded polymeric foam using a thermoplastic polymer composition of styrene-acrylonitrile copolymer having a copolymerized acrylonitrile comonomer content of 20 weight-percent or less, a mean acrylonitrile comonomer content that exceeds its median acrylonitrile comonomer content and an average copolymerized acrylonitrile comonomer distribution having a breadth at half-height that is greater than 2.5 weight-percent as measured at half peak height of a copolymerized acrylonitrile comonomer distribution curve for the styrene-acrylonitrile copolymer.

Extruded polystyrene foam with broad comonomer content distribution

Polymer foam containing styrene-acrylonitrile and containing one or more infrared attenuating agents achieves surprisingly high dimensional integrity at elevated temperatures.

Styrene acrylonitrile copolymer foam with infrared attenuating agents

A latex or fiber comprising a blend of polymeric materials consisting of one or more &agr;-olefin/ vinylidene monomer non-crosslinked substantially random interpolymers, wherein the distribution of the monomers of said interpolymers can be described by the Bernoulli statistical model or by a first or second order Markovian statistical model, and one or more homopolymers or copolymers of monomer components comprising aliphatic &agr;-olefins having from 2 to 20 carbon atoms, or aliphatic &agr;-olefins having from 2 to 20 carbon atoms and containing polar groups.

Blends of &agr;-olefin/vinylidene aromatic monomer or hindered aliphatic vinylidene monomer interpolymers with polyolefins

This invention pertains to a composition and a process for preparing a closed cell alkenyl aromatic polymer foam having enlarged cell size, comprising one or more alkenyl aromatic polymers, one or more substantially random interpolymers, one or more blowing agents having zero ozone depletion potential and optionally one or more co-blowing agents, and optionally, one or more nucleating agents and optionally, one or more other additives. This combination allows the manufacture of closed cell, low density alkenyl aromatic polymer foams of enlarged cell size, when blowing agents of relatively high nucleation potential are employed. When such blowing agents are used with alkenyl aromatic polymers in the absence of the substantially random interpolymers, small cell foams result.

ENLARGED CELL SIZE FOAMS MADE FROM BLENDS OF ALKENYL AROMATIC POLYMERS AND ALPHA-OLEFIN/VINYL OR VINYLIDENE AROMATIC AND/OR STERICALLY HINDERED ALIPHATIC OR CYCLOALIPHATIC VINYL OR VINYLIDENE INTERPOLYMERS

A foam comprising a blend of polymeric materials consisting of one or more &agr;-olefin/vinylidene monomer non-crosslinked substantially random interpolymers, wherein the distribution of the monomers of said interpolymers can be described by the Bernoulli statistical model or by a first or second order Markovian statistical model, and one or more homopolymers or copolymers of monomer components comprising aliphatic &agr;-olefins having from 2 to 20 carbon atoms, or aliphatic &agr;-olefins having from 2 to 20 carbon atoms and containing polar groups.

Blends of &agr;-olefin/vinylidene aromatic monomer or hindered aliphatic vinylidene interpolymers with polyolefins

Soft and flexible foams made from blends of alkenyl aromatic polymers and alpha-olefin/vinyl or vinylidene aromatic and/or sterically hindered aliphatic or cycloaliphatic vinyl or vinylidene interpolymers

A soft foam having an Asker C hardness of less than about 65, comprising;

Soft and flexible foams made from blends of alkenyl aromatic polymers

Enlarged cell size foams made from blends of alkenyl aromatic polymers

Growing community of inventors

Midland, MI, United States of America

Lawrence S Hood