A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer and at least one tribological modifier. The tribological modifier may comprise at least one tribological modifier comprising an ultra-high molecular weight silicone having a kinematic viscosity of greater than 100,000 mm.sup.2s.sup.1. The composition may exhibit a dynamic coefficient of friction against a counter-material of from about 0.01 to about 0.15. The polyoxymethylene polymer compositions provide polymer articles with improved tribological properties and mechanical properties.

An aromatic polyphenol derivative comprising at least one aromatic ring bearing at least two OZ groups in the meta position relative to one another, the two positions ortho to at least one of the OZ groups being unsubstituted, is used for the manufacture of a phenol-aldehyde resin for reinforcing a rubber composition. Each OZ group represents an OSi(R.sub.1R.sub.2R.sub.3) group with R.sub.1, R.sub.2, R.sub.3 representing, independently of one another, a hydrocarbon-based radical or a substituted hydrocarbon-based radical.

A resin composition for temporary fixing, the resin composition containing (A) a thermoplastic resin, (B) a thermosetting resin, and (C) a silicone compound, the resin composition having a shear viscosity of 4000 Pa.Math.s or less at 120? C. and a rate of change in the shear viscosity being within 30% as determined before and after the resin composition is left to stand for 7 days in an atmosphere of 25? C.

A resin composition for temporary fixing, the resin composition containing (A) a thermoplastic resin, (B) a thermosetting resin, and (C) a silicone compound, the resin composition having a shear viscosity of 4000 Pa.Math.s or less at 120? C. and a rate of change in the shear viscosity being within 30% as determined before and after the resin composition is left to stand for 7 days in an atmosphere of 25? C.

The invention relates to fluoropolymer filament for use in 3-D printing, and 3-D printed fluoropolymer articles having low warpage, excellent chemical resistance, excellent water resistance, flame resistance, and good mechanical integrity. Additionally, the articles of the invention have good shelf life without the need for special packaging. In particular, the invention relates to filament, 3-D printed polyvinylidene fluoride (PVDF) articles, and in particular material extrusion 3-D printing. The articles may be formed from PVDF homopolymers, copolymers, such as KYNAR resins from Arkema, as well as polymer blends with appropriately defined low shear melt viscosity. The PVDF may optionally be a filled PVDF formulation. The physical properties of the 3-D printed articles can be maximized and warpage minimized by optimizing processing parameters.

An epoxy-functional coupling agent comprises a reaction product of a polyepoxide and an aminosilane represented N by the formula HNR.sup.1R.sup.2. R.sup.1 represents ZSiL.sub.3 and R.sup.2 represents ZSiL.sub.3 or an alkyl group having from 1 to 4 carbon atoms. Each Z independently represents a divalent linking group having from 1 to 18 carbon atoms, and each L independently represents a hydrolyzable group. The coupling agent may be used to treat a substrate such as an abrasive particle, which may be included in a resin bond abrasive article.

An epoxy-functional coupling agent comprises a reaction product of a polyepoxide and an aminosilane represented N by the formula HNR.sup.1R.sup.2. R.sup.1 represents ZSiL.sub.3 and R.sup.2 represents ZSiL.sub.3 or an alkyl group having from 1 to 4 carbon atoms. Each Z independently represents a divalent linking group having from 1 to 18 carbon atoms, and each L independently represents a hydrolyzable group. The coupling agent may be used to treat a substrate such as an abrasive particle, which may be included in a resin bond abrasive article.

A structure based on glass strand coated with a resin composition containing, by weight percent of solid matter: from 75 to 98% of a mixture of a first novolac having a glass transition temperature lower than or equal to 60 C. and a second novolac having a glass transition temperature above 60 C.; from 0.5 to 10% of a wax; from 1 to 15% selected from an imine and a modified melamine of formula (I): ##STR00001##
where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are each independently H, CH.sub.2OH, CH.sub.2OCH.sub.3, or CH.sub.2OCH.sub.2OCH.sub.3 radical, with at least one of R.sub.1 to R.sub.6 not being H; and from 0 to 10% of a plasticizing agent. Also, a resin composition for producing a reinforcing structure and bonded abrasive articles incorporating such a structure.

A structure based on glass strand coated with a resin composition containing, by weight percent of solid matter: from 75 to 98% of a mixture of a first novolac having a glass transition temperature lower than or equal to 60 C. and a second novolac having a glass transition temperature above 60 C.; from 0.5 to 10% of a wax; from 1 to 15% selected from an imine and a modified melamine of formula (I): ##STR00001##
where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are each independently H, CH.sub.2OH, CH.sub.2OCH.sub.3, or CH.sub.2OCH.sub.2OCH.sub.3 radical, with at least one of R.sub.1 to R.sub.6 not being H; and from 0 to 10% of a plasticizing agent. Also, a resin composition for producing a reinforcing structure and bonded abrasive articles incorporating such a structure.

A structure based on glass strand coated with a resin composition containing, by weight percent of solid matter: from 75 to 98% of a mixture of a first novolac having a glass transition temperature lower than or equal to 60 C. and a second novolac having a glass transition temperature above 60 C.; from 0.5 to 10% of a wax; from 1 to 15% selected from an imine and a modified melamine of formula (I): ##STR00001##
where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are each independently H, CH.sub.2OH, CH.sub.2OCH.sub.3, or CH.sub.2OCH.sub.2OCH.sub.3 radical, with at least one of R.sub.1 to R.sub.6 not being H; and from 0 to 10% of a plasticizing agent. Also, a resin composition for producing a reinforcing structure and bonded abrasive articles incorporating such a structure.