A polymer optical fibre (POF) (30) for transmitting light of wavelength, ?i, between two separate elements of an active implantable medical device (AIMD), includes a core (31) which is cylindrical and made of a cyclic olefin polymer (COP) or copolymer (COC), having a core refractive index at the wavelength, ?i, n_core, A cladding (32) which has a cladding refractive index at the wavelength, ?i, n_clad<n_core, and which is made of a cladding copolymer including monomers of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride. The cladding being itself enclosed in a coating (33) which is made of a coating polymer formed of one of the monomers of the cladding copolymer. The POF has a numerical aperture, NA, at the wavelength, ?i, of at least 0.5.

A polymer optical fibre (POF) (30) for transmitting light of wavelength, ?i, between two separate elements of an active implantable medical device (AIMD), includes a core (31) which is cylindrical and made of a cyclic olefin polymer (COP) or copolymer (COC), having a core refractive index at the wavelength, ?i, n_core, A cladding (32) which has a cladding refractive index at the wavelength, ?i, n_clad<n_core, and which is made of a cladding copolymer including monomers of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride. The cladding being itself enclosed in a coating (33) which is made of a coating polymer formed of one of the monomers of the cladding copolymer. The POF has a numerical aperture, NA, at the wavelength, ?i, of at least 0.5.

Provided is a melt processible fluororesin molded article with reduced metal ions after molding (eluted metal ions) and submicron size fine particles. The melt processible fluororesin molded article has an amount of eluted Ni ions (in pg/cm.sup.2) and amount of eluted Cr ions (in pg/cm.sup.2) and amount of eluted Mo ions (in pg/cm.sup.2) in a test solution after eluting for 20 hours at 60? C. using 12% nitric acid, quantitatively analyzed by the ICP (induced coupled plasma) mass analysis method, satisfy the following formula:

[00001]$0.5?1-\left[\left(M_1+M_2\right)/\left(M_1+M_2+M_3\right)\right]<1,$

wherein M.sub.1 refers to the eluted Cr ion amount (in pg/cm.sup.2), M.sub.2 refers to the eluted Mo ion amount (in pg/cm.sup.2), and M.sub.3 refers to the eluted Ni ion amount (in pg/cm.sup.2).

Provided is a melt processible fluororesin molded article with reduced metal ions after molding (eluted metal ions) and submicron size fine particles. The melt processible fluororesin molded article has an amount of eluted Ni ions (in pg/cm.sup.2) and amount of eluted Cr ions (in pg/cm.sup.2) and amount of eluted Mo ions (in pg/cm.sup.2) in a test solution after eluting for 20 hours at 60? C. using 12% nitric acid, quantitatively analyzed by the ICP (induced coupled plasma) mass analysis method, satisfy the following formula:

[00001]$0.5?1-\left[\left(M_1+M_2\right)/\left(M_1+M_2+M_3\right)\right]<1,$

wherein M.sub.1 refers to the eluted Cr ion amount (in pg/cm.sup.2), M.sub.2 refers to the eluted Mo ion amount (in pg/cm.sup.2), and M.sub.3 refers to the eluted Ni ion amount (in pg/cm.sup.2).

In an embodiment the dielectric layer comprises a fluoropolymer, a plurality of boron nitride particles, a plurality of titanium dioxide particles, a plurality of silica particles; and a reinforcing layer. The dielectric layer can comprise at least one of 20 to 45 volume percent of the fluoropolymer, 15 to 35 volume percent of the plurality of boron nitride particles, 1 to 32 volume percent of the plurality of titanium dioxide particles, 10 to 35 volume percent of the plurality of silica particles, and 5 to 15 volume percent of the reinforcing layer; wherein the volume percent values are based on a total volume of the dielectric layer.

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.

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.

The present invention relates to high thermal resistance synthetic rubber and a compound for a wheel balance weight using the same. In some aspects, the high specific gravity compound for the wheel balance weight has excellent curve adhesive strength and is capable of being cut and used as needed. Provided herein is a method of forming a high thermal resistance elastic body synthetic rubber. The method includes blending acrylic rubber and fluoro rubber. A wheel balance weight having a high specific gravity elastic body can be formed by using the high thermal resistance synthetic rubber described herein as a base polymer and a metal powder.

The present invention relates to high thermal resistance synthetic rubber and a compound for a wheel balance weight using the same. In some aspects, the high specific gravity compound for the wheel balance weight has excellent curve adhesive strength and is capable of being cut and used as needed. Provided herein is a method of forming a high thermal resistance elastic body synthetic rubber. The method includes blending acrylic rubber and fluoro rubber. A wheel balance weight having a high specific gravity elastic body can be formed by using the high thermal resistance synthetic rubber described herein as a base polymer and a metal powder.

The present invention relates to high thermal resistance synthetic rubber and a compound for a wheel balance weight using the same. In some aspects, the high specific gravity compound for the wheel balance weight has excellent curve adhesive strength and is capable of being cut and used as needed. Provided herein is a method of forming a high thermal resistance elastic body synthetic rubber. The method includes blending acrylic rubber and fluoro rubber. A wheel balance weight having a high specific gravity elastic body can be formed by using the high thermal resistance synthetic rubber described herein as a base polymer and a metal powder.