Mitsui Chemicals, Inc.

Shigeyuki Yasui

Seiji Ota

Hideshi Kawachi

Yuji Sawada

Akihiko Iwashita

Hideki Mochizuki

Yuichiro Terashi

Takashi Sakuma

Setsuko Funaki

Akihide Mori

A propylene polymer satisfying (a) below, a soft propylene copolymer satisfying (b) below, and a polyolefin containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, wherein (a) a melting point is 100&#xb0; C. or more, and (b) an MFR is in the range of 0.01 to 100 g/10 min, at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction s 60% or more, and (b-2) a structural unit derived from propylene is 55 to 90 mol % and a structural unit derived from at least one olefin having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (with provisos), and the relation between an intrinsic viscosity [&#x3b7;] (dL/g) and the MFR satisfies the relation: 1.50&#xd7;MFR&#x2264;[&#x3b7;]&#x2264;2.65&#xd7;MFR.

Polypropylene resin composition and monolayer and multilayer film

Provided is a polypropylene-based adhesive having an MFR of 2.7 g/10 min or higher, as measured at 230 &#xb0; C. under a load of 2.16 kg, comprising a composition which contains 5-95 parts by weight of (A) an isotactic polypropylene, 95-5 parts by weight of (B) a propylene/ethylene random copolymer, and 0-40 parts by weight of (C) an ethylene/propylene random copolymer, wherein 100 parts by weight of the composition is graft modified with 0.001-5 parts by weight of an unsaturated carboxylic acid and/or a derivative thereof, and wherein (B) is characterized by the following (i) to (iii): (i) the propylene/ethylene random copolymer (B) contains 60-90 mol % units derived from propylene and 10-40 mol % units derived from ethylene; (ii) the melting point (Tm) is in the range of 40-120 &#xb0; C.; and (iii) the molecular weight distribution (Mw/Mn) is in the range of 1.0-3.0.

Adhesive and laminate made with the same

It is an object of the invention to provide polypropylene adhesives which have excellent adhesion to polar materials and exhibit particularly excellent adhesion after high-speed cast film processing, stretching or extrusion coating, and are excellent in blushing resistance, and multilayer structures having the adhesives. The adhesive resin composition is a grafted resin composition comprising a polypropylene component (A), an ethylene/propylene/&#x3b1;-olefin copolymer component (B), an ethylene/&#x3b1;-olefin copolymer component (C), and an unsaturated carboxylic acid and/or a derivative thereof (D), and which contains the component (A) at 5 to 80 parts by mass, the component (B) at 5 to 70 parts by mass and the component (C) at 1 to 40 parts by mass based on 100 parts by mass of the components (A), (B) and (C) combined and has an ethylene/propylene/&#x3b1;-olefin ratio in n-decane-soluble components of 5-95/5-95/1-50 mol % and a graft ratio of 0.01 to 5 wt %.

Adhesive and multilayer structure having the same

It is an object of the invention to provide a carbodiimide modified polyolefin adhesive having excellent adhesive strength in a room temperature atmosphere and excellent adhesive strength in a high temperature atmosphere even in continuously molding with a practical molding machine. An adhesive (D), i.e., a carbodiimide modified polyolefin adhesive of the present invention which can solve the above problem is obtainable by allowing a polyolefin (A) having a group capable of reacting with a carbodiimide group to react with a carbodiimide group-containing compound (B) in the presence of an unmodified polyolefin (C) and having a ratio of a peak intensity at 2130 to 2140 cmto a peak intensity at 1470 cm, as determined by infrared absorbance analysis, of not more than 60% and a density of 0.870 g/cmto 0.920 g/cm. Furthermore, the use of the adhesive provides a laminate of a polar resin (F) and a polyolefin (G) having excellent interlaminar adhesive force both under a room temperature atmosphere and under a high temperature atmosphere.

Adhesive and laminate prepared using the adhesive

A propylene-based polymer composition for adhesive use and a laminate structure thereof are provided, wherein decrease of bonding strength is prevented when the laminate structure is formed and heat treatment is applied and whitening in bending process is suppressed. Provided are a propylene-based polymer composition (D) for adhesive use comprising (i) 40 to 92 wt % of a graft-modified polypropylene (A); (ii) 5 to 30 wt % of an ethylene.&#x3b1;-olefin copolymer (B) having a melt flow rate (MFR) of 0.01 to 10 g/10 min at 230&#xb0; C. under a load of 2.16 kg and a density of 0.940 g/cmor less; and (iii) 3 to 30 wt % of a block copolymer (C) composed of an olefin crystalline segment and an ethylene.&#x3b1;-olefin segment, wherein the sum of (A), (B) and (C) is 100 wt %, and a laminate comprising at least one layer of the propylene-based polymer composition for adhesive use.

Propylene-based polymer composition for adhesive use and laminate thereof

The modified polypropylene composition of the invention comprises (A) modified polypropylene having been partially or wholly graft modified with an unsaturated carboxylic acid or its derivative, (B) an amorphous or low-crystalline ethylene/&agr;-olefin copolymer having a specific MFR and a specific density and (C) a styrene elastomer, in a specific ratio. The component (A) is a graft modification product of a propylene homopolymer and/or a graft modification product of a propylene/&agr;-olefin random copolymer. The laminate of the invention comprises a composition layer comprising the modified polypropylene composition and a resin layer provided on one or both surfaces of the composition layer. By the use of the modified polypropylene composition as a laminate-forming composition or an adhesive resin composition, there can be obtained a laminate which has excellent interlaminar strength and which can be prevented from lowering of the interlaminar strength even if it is subjected to a heat treatment at a high temperature such as a temperature of 80 to 125&deg; C.

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Rye Brook, NY, United States of America

Shigeyuki Yasui