59results about How to "Good low temperature heat sealability" patented technology

The present invention relates to an ethylene-alpha-olefin copolymer; a composition thereof; a film thereof; a polar group-containing resin material; and productions and use of the ethylene-alpha-olefin copolymer. The ethylene-alpha-olefin copolymer of the present invention is characterized in satisfying the following conditions (A) to (E): (A) a density in the range of 0.92 to 0.96 g / cm3; (B) a melt flow rate (MFR) in the range of 0.01 to 200 g / 10 min; (C) a molecular weight distribution (Mw / Mn) in the range of 1.5 to 5.0; (D) possessing only one peak in terms of the number of peaks observed in an elution temperature-eluted amount curve as measured by the continuous temperature raising elution fractionation (TREF) method, from the integrated elution curve obtained by the elution temperature-eluted amount curve, the difference T75-T25 in the temperature and density d respectively satisfy a specific relationship, wherein T25 is the temperature where 25% of the total elution is obtained, and T75 is the temperature where 75% of the total elution is obtained; and (E) possessing one or two melting point peaks, and among these the highest melting point Tm1 and the density d satisfy a specific relationship. Accordingly, this ethylene-alpha-olefin copolymer exhibits a superior thermal resistance, heat sealability, and processability.

Disclosed is a polypropylene resin composition which has good moldability and enables to obtain a film or sheet having excellent transparency and heat sealing property. Specifically disclosed is a polypropylene resin composition composed of 1-50% by weight of a propylene polymer (A) having a melting point Tm as measured by a differential scanning calorimeter (DSC) of not less than 150 DEG C, 10-90% by weight of a propylene copolymer (B) having a melting point Tm of not less than 100 DEG C but less than 150 DEG C, and 1-80% by weight of an olefin copolymer (C) having a melting point of not less than 40 DEG C but less than 100 DEG C. The olefin copolymer (C) is composed of (a) not less than 50% by mole of either of a constitutional unit derived from propylene and a constitutional unit derived from 1-butene, and (b) not more than 50% by mole of one or more constitutional units other than (a) selected from constitutional units derived from a-olefins having 2-20 carbon atoms (with the total of (a) and (b) being 100% by mole). A film obtained from such a resin composition is suitable as a packaging film for foods or the like.

Provided is a lactic acid-based resin composition that comprises a lactic acid-based (component (A)), and an ethylene-unsaturated carboxylic acid copolymer (component (B)) and / or an ethylene-unsaturated carboxylic acid copolymer ionomer (component (C)). The lactic acid-based resin composition has good physical properties in melt and can be efficiently formed into films and laminates through casting or extrusion lamination. The paper laminates obtained through extrusion with the resin composition have good moisture barrier property, and have the advantages of good antibacterial ability, good biodegradability and low combustion heat. And the moldings obtained from the resin composition of the invention have a characteristic which is excellent in impact strengh.

The invention relates to a polypropylene / polyethylene composite medical packaging film with a seven-layer structure, which adopts mixed modified resin as a seal coat, and polypropylene / polyethylene mixed resin in various proportions as other layers. In comparison with the prior art, the polypropylene / polyethylene composite medical packaging film has the main advantages that 1) the packaging film is excellent in flexibility and formability; 2) an excellent heat-sealing strength with non-adhesive paper is guaranteed; 3) the packaging film is capable of effectively separating bacteria and resisting puncture, and is applied in a sterile environment; 4) the packaging film can guarantee stable contents, heat resistance, no generation of harmful substance migration and other sanitation performances; and 5) in comparison with the conventional dry-type composite process, the environmental friendliness is better improved.

The invention provides a polyester resin aqueous dispersion, a coating film made by removing the polyester resin aqueous medium and a packing bag made by thermal melting of the coating film. The polyester resin aqueous dispersion is characterized by containing a polyester resin (A) having a number average molecular weight of not less than 5000 and a glass transition temperature of not less than 50 DEG C and a polyester resin (B) having a number average molecular weight of not less than 9000 and a glass transition temperature of not more than 30 DEG C at a mass ratio (A):(B) of 80 / 20-20 / 80. This polyester resin aqueous dispersion is capable of forming a resin coating film having excellent blocking resistance and adhesion without suffering from cracking even when the film is formed at low temperatures. In addition, the polyester resin aqueous dispersion is capable of forming a resin coating film having excellent adhesion even when it is heat-sealed at low temperatures. Also disclosed are a coating film obtained by removing a polyester resin aqueous medium, and a packaging bag obtained by thermally fusion-bonding such a coating film.

The invention relates to a polyamide / polypropylene composite medical packaging film. The packaging film adopts polyamide as the outer layer to keep heat resistance and puncture resistance, reduce moisture absorption rate, guarantee barrier property and fit for high-temperature high-moisture environments; a heat seal layer adopts metallocene polyethylene (mLLDPE) and ethylene-methyl acrylate (EMA) blend modified resin to guarantee good heat sealing between the film and a non-adhesive breathable paper; the polyamide crystallization speed and polyethylene crystallization speed have larger difference, and in the production technology, the heat seal layer (polyethylene) is put at the utmost outer layer, the polypropylene layer is put in the inner layer, so that the coiling of the film surface is solved and the flat heat sealing with the non-adhesive breathable paper is guaranteed; the film is coextruded and blown by using a bottom blowing water cooling method to guarantee that the transparency of the film surface is not less than that of the dry composite film; and meanwhile, the dew point height, the blow-up ratio and the traction ratio are strictly controlled during production so that optimal formability of the film in the longitudinal and transverse directions is guaranteed. Compared with the prior art, the packaging film has good comprehensive performance and high market competition strength, and is material-saving and competitive in markets.

Disclosed is an ethylene polymer which is a copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms and satisfies the following requirements [1] to [4]: [1] the MFR value falls within the range from 0.10 to 100 g / 10 min.; [2] the density (D) falls within the range from 860 to 930 kg / m<3>; [3] the ratio (Mw / Mn) of the weight average molecular weight to the number average molecular weight falls within the range from 1.50 to 3.00 inclusive; and [4] both the ratio (H / W) of the height (H) of a peak having the highest peak intensity to the width (W) of the peak at a height which is half of the height (H) in an elution curve given by temperature rising elution fraction and the density (D) satisfy a specified relationship in accordance with the MFR value of the requirement [1]. Also disclosed is a molded article which comprises the ethylene polymer, is excellent in blocking resistance, a low-temperature heatseal property and a mechanical strength, and can be used suitably for a film or the like.

The invention relates to a porous film for a bag-constituting member and a bag-constituting member for a disposable body warmer. The invention aims at providing a porous film for a bag-constituting member which has good low-temperature heat sealability. In addition, the invention aims ar providing a bag-constituting member for a disposable body warmer which uses the porous film for a bag-constituting member. The porous film for a bag-constituting member is characterized in that the porous film is prepared by a linear low-density polyethylene, an olefinic copolymer having a Vicat softening point of from 20 DEG C to 50 DEG C and a density of less than 0.900 g / cm3 and an inorganic filler, and is formed by stretching an unstretched film to be porous.