摘要:
The invention relates to an adhesive composition wherein such composition comprises at least one polypropylene copolymer and wherein such adhesive composition has improved overall bond performance. It further relates to an article comprising said adhesive composition, as well as to a process for producing such article. It even further relates to the use of the adhesive composition in the preparation of an article.
摘要:
The present invention relates to a method for the manufacture of polypropylene having a target melt flow rate of from 10 to 200 g/10 min as determined in accordance with ISO 1133 (230° C., 2.16 kg) comprising the sequential steps of i) polymerizing propylene monomer, and optionally one or more alpha olefin co-monomers so as to form a polypropylene having an initial melt flow rate of from 0.5 to 20 g/10 min (ISO 1133, 230° C., 2.16 kg), ii) visbreaking said polypropylene to obtain polypropylene having said target melt flow rate and wherein the ratio of target to initial melt flow rate is more than 1 iii) maintaining the polypropylene obtained from step ii) at an elevated temperature for a time sufficient to reduce the FOG value of the polypropylene as determined in accordance with VDA 278. The method allows the time for FOG reduction to be reduced as compared to polypropylenes that have the same target melt flow rate, yet which have obtained said melt flow rate without the visbreaking step.
摘要:
The present invention relates to a polypropylene composition comprising a branched polypropylene (b-PP) having high melt strength (HMS). Furthermore, the present invention also relates to a method for providing the corresponding polypropylene having composition comprising the branched polypropylene (b-PP) and to a film with the polypropylene composition comprising the branched polypropylene (b-PP). The branched polypropylene (b-PP) is based on a random copolymer with a small amount of ethylene.
摘要:
The present invention relates to a high flow polypropylene composition comprising (A) a low molecular weight propylene homopolymer fraction and (B) a high molecular weight propylene copolymer fraction,
wherein the ratio between the MFR 2 of fraction (A) and the MFR 2 of fraction (B) is at least 3 and wherein the MFR 2 of the entire composition is at least 5 g/10 min, the values of MFR 2 being measured according to ISO 1133 (230 °C, 2.16 kg load), and to processes for producing such compositions and to articles made there from.
摘要:
The partially cross-linked polymer composition of the present invention is obtainable by dynamically heat-treating: 95 to 50% by weight of a resin (A) comprising an ethylene copolymer containing 5 to 48% by weight of units derived from at least one monomer selected from vinyl acetate, (meth)acrylic acid, (meth)acrylate ester, glycidyl (meth)acrylate and carbon monoxide, and 5 to 50% by weight of a resin (B) having a melt viscosity (JAI 7-1991) at 180°C of over 10,000 mPa·Es and comprising a two or more-competent propylene copolymer containing 0.1 to 20% by mol of units derived from α-olefins other than propylene, or a blend of the two or more-component propylene copolymer and a propylene homopolymer in the presence of an organic peroxide (C) in an amount of from 0.001 to 4 parts by weight based on 100 parts by weight of the total amount of the resins (A) and (B). The invention can provide the polymer compositions having excellent fluidity and productivity, which allow to produce molded articles with heat resistance, adhesion with paint, tensile strength, flexibility, stress crack resistance, and RF weldability, such as molded articles for automobile exterior trim, and can provide the process for producing the polymer compositions.
摘要:
The present invention relates to a pneumatic tire with a built-in depolymerized sealant layer. The built-in sealant layer is of a composition comprising a partially depolymerized butyl rubber or alternatively a composite of partially depolymerized butyl rubber, together with partially depolymerized cis 1,4-polyisoprene rubber and/or partially depolymerized liquid polyisoprene polymer, which contains a pre-hydrophobated silica. The sealant layer may also contain a colorant of a non-black color which produces a built-in sealant layer of a color which contrasts with a black. The butyl rubber-based sealant precursor is built into the tire as a layer to form a tire assembly including such sealant precursor layer wherein the butyl rubber or butyl rubber-based composite portion of the sealant precursor layer is at least partially depolymerized during a subsequent curing of the tire at an elevated temperature in a suitable mold to form the tire having the resultant built-in sealant layer.
摘要:
The partially cross-linked polymer composition of the present invention is obtainable by dynamically heat-treating: 95 to 50 % by weight of a resin (A) comprising an ethylene copolymer containing 5 to 48 % by weight of units derived from at least one monomer selected from vinyl acetate, (meth)acrylic acid, (meth)acrylate ester, glycidyl (meth)acrylate and carbon monoxide, and 5 to 50 % by weight of a resin (B) having a melt viscosity (JAI 7-1991) at 180oC of over 10,000 mPa·Es and comprising a two or more-component propylene copolymer containing 0.1 to 20 % by mol of units derived from α-olefins other than propylene, or a blend of the two or more-component propylene copolymer and a propylene homopolymer in the presence of an organic peroxide (C) in an amount of from 0.001 to 4 parts by weight based on 100 parts by weight of the total amount of the resins (A) and (B). The invention can provide the polymer compositions having excellent fluidity and productivity, which allow to produce molded articles with heat resistance, adhesion with paint, tensile strength, flexibility, stress crack resistance, and RF weldability, such as molded articles for automobile exterior trim, and can provide the process for producing the polymer compositions.
摘要:
A co-extruded sheet made from olefin polymer materials includes (1) at least one outer layer of (a) a propylene polymer having a melt flow rate of 0.5-15 dg/min, or a graft copolymer comprising a backbone of a propylene polymer material, to which is graft polymerized a vinyl monomer, and (b) a nucleating agent having a melting point greater than 265 °C and (2) another layer made from (a) about 5 % to about 50 % of a high melt strength propylene homopolymer or copolymer, and/or about 5 % to about 40 % of chopped glass fibers, (b) optionally about 5 % to about 40 % of an inorganic filler, (c) about 2 % to about 50 % of an olefin polymer composition, and (d) optionally about 5 % to about 70 % of one or more other olefin polymer materials. When the second layer is reinforced with glass fibers, the stiffness of the sheet is increased while maintaining impact strength. The sheet has high surface gloss and good chemical resistance, and can be thermoformed using a melt phase thermoforming process wherein the surface temperature of the nucleated propylene polymer layer is from at least 310 °F.