Abstract:
A process for producing modified propylene polymers by subjecting a polypropylene homopolymer satisfying the requirements (a) to (e): (a) mmmm = 20 to 60 mole%, (b) [rrrr/(1-mmmm)] 2.5 mole%, (d) mm x rr/(mr) C-NMR spectroscopy is 55 to 90 mole% to modification with a radical initiator and an organic acid; modified propylene polymers obtained by the process; and adhesive compositions containing the modified propylene polymers. The modified propylene polymers can impart high adhesiveness, high strength, and softness to polyolefins and so on and give sealants having high adhesiveness or polyolefins improved in the compatibility with inorganic fillers or the like, and are useful particularly as resins for hot-melt adhesives.
Abstract:
A process for producing a butene-1 polymer which: (a) is a crystalline resin having a melting point (Tm-D), defined as the temperature corresponding to the top of the peak observed on the highest-temperature side in a melting endothermic curve obtained by DSC analysis in which a sample in a nitrogen atmosphere is held at -10°C for 5 minutes and then heated at a rate of 10 °C/min, of 0 to 100°C; (b) has a stereoregularity index represented by [mmmm]/([mmrr]+[rmmr]) of 20 or lower; and (c) has a weight-average molecular weight (Mw) of 10,000 to 1,000,000 and a weight-average molecular weight/number-average molecular weight ratio (Mw/Mn) of 4.0 or lower. Also provided are: a modified butene-1 polymer obtained by modifying the butene-1 polymer with a free-radical initiator and an organic acid; and an adhesive composition containing the modified butene-1 polymer. The modified butene-1 polymer can impart high adhesion, high strength, flexibility, etc. to polyolefins, etc. It gives a highly adhesive sealant or a polyolefin having improved compatibility with inorganic fillers, etc. It is especially useful as a resin for hot-melt adhesives.
Abstract:
An alpha-olefin polymer composition which is obtained by mixing (A) an alpha-olefin polymer, (B1) an organosilicon compound, and (C) a modified alpha-olefin polymer having a substituent reactive with a polar group and exhibiting a limiting viscosity of 0.7 dl/g or above or by bringing the components (A), (B1) and (C) into contact with each other; a modified polypropylene resin composition which is obtained by mixing (C2) a polypropylene resin having a polar group and (B) a silane coupling agent and which is specified in melt tension and MFR and has a p-xylene insolubles content of 1 wt% or below; and a process for the production of modified alpha-olefin polymer compositions, characterized by mixing a mixture consisting of (C6) a modified alpha-olefin polymer specified in limiting viscosity, Mw/Mn ratio and polar group content and (B) a silane coupling agent with (A) an alpha-olefin polymer having a limiting viscosity of 0.7 to 5.0 dl/g at an (A)/[(B) + (C)] weight ratio of 0/100 to 99/1.
Abstract:
An acid−modified propylene polymer satisfying the following (1) to (3). The intrinsic viscosity [&eegr;] (as measured in decalin at 135°C): 1 dL/g or higher. The ratio of acid content to the number of polymer chains (ß value): from 0.5 to 3.0. The content of components having molecular weight Mw of 10,000 or lower (LP content): 0.5 wt.% or lower. The content of unreacted acid (compound containing ethylenic double bond and polar group in the same molecule): 2 wt.% or lower. The polymer has a high molecular weight and retains properties of the raw propylene polymer. It is hence usable as a film or molding.
Abstract:
A propylene polymer composition comprising (A) a propylene block copolymer or a composition consisting of a propylene polymer and a rubber ingredient and (B) a polyolefin copolymer which contains a component eluted at 101°C and higher in temperature-rising fractional chromatography and giving, in C-NMR spectrometry, a peak attributable to an ethylene chain and which has an intrinsic viscosity as measured in decalin at 135°C of 0.5 to 10.0 dl/g; a molded object obtained from the composition; and a polyolefin copolymer which comprises a propylene polymer segment and an ethylene copolymer segment chemically bonded to each other and is the ingredient (B). The propylene block copolymer or the composition comprising a propylene polymer and a rubber ingredient can have excellent impact resistance and excellent tensile strength at break while retaining high rigidity.
Abstract:
A composite resin composition which comprises (A) 100 parts by weight of a polypropylene resin, (B) 0.1 to 50 parts by weight of an organic−modified clay, and (C) 0.5 to 30 parts by weight of a polypropylene modified with maleic anhydride, wherein in the modified polypropylene, the content of unreacted maleic anhydride is below the detection limit for quantitative analysis, the proportion of the acid content to the number of polymer chains is 0.8 to 2.0, the molecular−weight distribution is 2.5 or lower, the content of components having a molecular weight of 10,000 or lower is 0.5 wt.% or lower, and the intrinsic viscosity [&eegr;] is 1 or higher. A supercritical gas is infiltrated into the composite resin composition and then removed therefrom to obtain a resin foam. Thus, fine cells can be evenly formed at a high density, and high rigidity can be attained.