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TSN: Curable Polyphenylene Ether Compositions

IP.com Disclosure Number: IPCOM000006538D
Publication Date: 2002-Jan-11
Document File: 5 page(s) / 63K

Publishing Venue

The IP.com Prior Art Database

Related People

Hua Guo, Ph.D.: CONTACT

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TSN:  Curable Polyphenylene Ether Compositions

                    TSN is a curable resin system with potential application in the field of composite materials, e.g., in BMC and SMC materials.  TSN comprises of poly(phenylene ether) resin (“PPE”) containing one or more curable groups, one or more polymerizable monomers, at least one crosslinking species, an initiator or catalyst and various other additives such as pigments, rubbers, stabilizers, flow modifiers, surface appearance modifiers, and the like.  The curable groups on the PPE can vary widely and include, e.g., acrylic, styrenic, and other olefin-containing moieties.  The number and location of the curable groups can vary on the polymer chain as well as the molecular weight.

                    The polymerizable monomer is usually a monomer or combination of monomers that can be radically polymerized and often include an acrylic, methacrylic, or one or more styrenic components such as styrene.  The crosslinking species can have two or more radically curable functionalities including, e.g., acrylic, styrenic, and other types of olefins. 

Radically initiators typically used in TSN include peroxide-based initiators and can contain azo, oxyamine, metal-containing, or other functionalities that initiate free radical curing reactions that lead to a crosslinked network.  As previously mentioned, TSN can also include additional components including, e.g., low profile additives, thickeners, impact modifiers, as well as additional monomers, crosslinkers, or initiators.

                    In addition to varying the different components in the mixture, one can also vary the percentages of individual components to influence the properties of the end product.  Of particular interest is the percentage of crosslinker, as well as the styrene/ PPE ratio.  The PPE itself can be tuned by varying the molecular weight, viscosity, and degree and location of olefinic functionality.  Copolymer PPE resin may also be used in TSN.  TSN can be used alone or in conjunction with fillers, reinforcement agents, mold release agents, or other property-enhancing aids.  Especially useful are glass fiber reinforcement and glass fiber/mineral reinforcements.  Also useful are glass mats (random, oriented, and woven mats) as well as long fiber reinforced materials.  Conductivity enhancing additives, e.g., conductive powders and fibers are also useful.

                    As can be seen from Table 1, TSN can possess better properties than unsaturated polyester resin (UPR) and vinyl ester (VE) resin, both of which are commonly used in sheet molding compound (SMC) and bulk molding compound (BMC) composite applications.


Table 1.  Neat Resin Properties of TSN and Competitive Materials

aTSN: PPE capped with methacrylic moieties/Styrene/trimethylolpropane triacrylate/benzoyl t-butyl peroxide in weight ratio of 42.5/42.5/15/1

From these results with neat, unreinforced resin systems, it would be expected that TSN will offer advantages in filled and/or reinforced composites such as SMC, BMC, structured reaction injection moldi...