36results about How to "Low yellowness index" patented technology

A white film whose thickness is in the range from 1 to 500 μm and which comprises, as principal constituent, a crystallizable thermoplastic, wherein the film comprises at least one UV stabilizer as light stabilizer and at least one white pigment, the use of the film, and also a process for its production.

The present invention relates to an alkyl (meth)acrylate-based thermoplastic resin composition, and to a thermoplastic resin having adjusted scratch resistance and yellowness. More particularly, the total content of vinyl cyanide-based monomers contained within the resin composition is lowered to a level which could not be achieved in conventional technologies and the content of alkyl(meth)acrylate-based monomers is increased while maintaining transparency, flowability, and impact strength and improving scratch resistance and lowering yellowness. More particularly, the alkyl (meth)acrylate-based thermoplastic resin composition and thermoplastic resin according to the present invention have superior impact resistance and transparency and low yellowness. More particularly, the alkyl (meth)acrylate-based thermoplastic resin composition and the thermoplastic resin according to the present invention have high surface hardness and high transparency similar to glass, and therefore are suitable for use in a transparent housing of an electric or electronic product.

Embodiments relate to a polymerizable composition for a polythiourethane-based optical material, the polymerizable composition enabling a high-quality polythiourethane-based optical material to be produced without complicated purification processes, by comprising a certain additive and appropriately adjusting the reactivity of isocyanate such that the viscosity can be maintained to be low for a certain period of time. In addition, the polythiourethane-based optical material of the embodiments has not only a uniform refractive index but also a low yellow index, and thus can be usefully used forvarious plastic optical lenses such as lenses for eyeglasses, camera lenses, etc.

The present invention relates to a polyamide-imide (PAI) polymer comprising repeating units according to any one of formulae (I) and (II) wherein: Z is an alicyclic moiety selected from the group consisting of: a substituted or unsubstituted monocyclic or polycyclic group having 5 to 50 carbon atoms, preferably 6 to 18 carbon atoms; r is a divalent alicyclic moiety selected from the group consisting of: a substituted or unsubstituted monocyclic or polycyclic group having 5 to 50 carbon atoms, preferably 6 to 20 carbon atoms; m and n independently of each other are integers from 0 to 10.

The invention discloses a white polyimide composite film and a preparation method thereof. The composite film comprises a three-layer structure, wherein the surface layer is a white polyimide layer, and the core layer is a polyimide layer; the preparation method is: ( 1) Preparation of white polyimide glue solution: first make TiO 2 Disperse in a solvent, then add polyimide, and mix evenly; (2) Preparation of the precursor glue of the core layer polyimide: dissolve the diamine monomer in the solvent, add the dianhydride monomer after completely dissolving, Stir the reaction to obtain the precursor glue of polyimide; (3) coating of glue: coat the precursor glue of white polyimide, core layer polyimide and white polyimide on the substrate successively. imide glue solution to obtain a multi-layer composite coating; (4) preparation of the film: the multi-layer composite coating is placed in an oven, the temperature is raised, and then naturally cooled to obtain a white polyimide composite film. The invention provides a white polyimide composite film with better mechanical properties and lower yellowness value.