33results about How to "Stable Peel Strength" patented technology

Disclosed is a cover tape which comprises at least a base layer (A), an intermediate layer (B), a peeling layer (C), the primary component of which is a thermoplastic resin, and a heat seal layer (D), the primary component of which is a thermoplastic resin that can be heat sealed to a carrier tape. The tensile storage modulus (c) of the thermoplastic resin that constitutes the peeling layer (C) is within the range of 1*106 Pa to 1*108 Pa. The tensile storage modulus (d) of the thermoplastic resin that constitutes the heat seal layer (D) is within the range of 1*108 Pa to 1*10<10> Pa. The ratio of (c) and (d) satisfies 1*104>=(d) / (c)>=1*10. This kind of cover tape has the appropriate peel strength and sufficiently low fluctuation in peel strength when heat sealed to a thermoplastic resin carrier tape. Therefore, the tape will not tear even under shock caused by high-speed peeling, and adherence of electronic parts does not occur even when set aside for a long period of time of 24 to 72 hours in a high-temperature environment of 60 to 80 C.

The invention discloses a strippable surface protective film, which comprises a polymer matrix layer and a layer of thermally activable adhesive composition on the polymer matrix layer. The composition comprises: (a), over 15 weight percent of an ethylene-vinyl acetate copolymer from vinyl acetate fragment or an ethylene-C1 to C4 alkyl (methyl)acrylate copolymer; (b), an ethylene-vinyl acetate copolymer having a dicarboxylic acid anhydride fragment or an ethylene-C1 to C4 alkyl (methyl)acrylate copolymer; (c) 3 to 35 weight percent of thickening agent; and (d) 4.5 to 30 weight percent of modifier which is at least one of sudex, ethylene-alpha-olefin copolymer, noblen, propylene polymer and ethylene-vinyl acetate copolymer containing less than 15 weight percent of vinyl acetate or is the polymer of the mixture of the sudex, ethylene-alpha-olefin copolymer, noblen, propylene polymer, ethylene-vinyl acetate copolymer containing less than 15 weight percent of vinyl acetate. Based on the total weight of the composition, the total weight of the (a) and (b) is 45 to 92 percent and the acid anhydride fragment is 0.02 to 2 weight percent; and a C(=O)O fragment in the (a) and (b) accounts for 7 to 15 percent of the total weight of the (a) and (b). The invention also discloses a product protected by the protective film.

The present invention relates to a metal foil laminated polyimide resin substrate whereina metal foil is directly laminated on one side or both sides of a polyimide resin substrate; andthe surface of the metal foil to be bonded to the polyimide resin substrate has a surface roughness (Rzjis) of 3.0 μm or less; a surface area ratio (B) of 1.25 to 2.50, in which the surface area ratio (B) is calculated as a ratio [A / 6550] of a surface area of a two-dimensional region with a surface area of 6550 μm2 which is determined by a laser method (three-dimensional area: A μm2) to the area of the two-dimensional region; and a chromium content per unit area of the two-dimensional region of 2.0 mg / m2 or more.

The invention discloses a release paper using stearate as a release agent, comprising sequentially compounded base paper, an anti-penetration primer layer and a release layer, the release layer uses stearate as a release agent, Using high-temperature-resistant polyvinyl alcohol as the resin, the raw material of the release layer consists of: 100-300 parts of polyvinyl alcohol solution; 0-20 parts of alkyd resin; 2 parts of stearate release agent ‑30 parts; matting agent 2‑36 parts; paint additives 1‑10 parts; water 30‑200 parts. The release paper of the invention has high temperature resistance, can be simultaneously applied to the production process of PU, PVC and PU / PVC composite artificial leather, has low coating amount and does not curl, and can adjust its peeling strength according to different artificial leather resins.

The invention discloses aqueous polyurethane resin for a pressure-sensitive adhesive and a preparation method thereof. The preparation method comprises the following steps of carrying out pressure reduction dehydration on hydroxyl-terminated polyester polyol, carrying out cooling, adding diisocyanate into a reactor, carrying out a reaction process at a temperature of 70-90 DEG C for 110-120min, adding a dimethylolpropionic acid solution into the reaction product, carrying out a reaction process for 110-120min, cooling the reaction product to 50-55 DEG C, adding triethylamine into the reaction product for neutralization, carrying out full stirring for 8-10min, stopping stirring, fast pouring deionized water into the reactor, starting stirring and emulsification devices, carrying out emulsification for 8-10min, adding an ethanediamine solution into the emulsion, sequentially carrying out emulsification for 8-10min, stopping emulsification, sequentially carrying out stirring for 90-120min, carrying out filtration and discharging the product. The aqueous polyurethane resin has 180 degree peel strength of 30-300g / 25mm. Through coating machine-based coating, a plurality of the pressure-sensitive adhesive products with excellent performances are obtained and can be widely used for all industries. The preparation method is simple and easy.

The invention discloses a protective film for surfaces with various roughnesses, which comprises a base material layer and an adhesive layer arranged on the base material layer, wherein the adhesive layer comprises the following components by weight: polyurethane 100 parts of resin; 40-50 parts of silicone modified polyester resin; 3-5 parts of inorganic filler; 120-130 parts of organic solvent; 1-2 parts of pressure-sensitive adhesive; 0.2-0.6 parts of dispersant. By improving the formulation of the adhesive layer, the viscosity stability of the adhesive layer is improved, so that the adhesive layer has stable and excellent adhesiveness on surfaces with different roughnesses.

The invention discloses an antistatic protective film with stable viscosity. The antistatic protective film comprises a PET base material layer, antistatic layers arranged on the upper surface and thelower surface of the PET base material layer, and adhesive layers arranged on the outer surfaces of the antistatic layers; each antistatic layer is prepared from the following components in parts byweight: 100 parts of lithium bisimide, 5-10 parts of dimethyl fumarate, 5-8 parts of glass powder and 3-5 parts of a dispersant; and each adhesive layer is prepared from the following components in parts by weight: 100 parts of polyurethane resin, 5-10 parts of poly-n-butyl methacrylate, 15-20 parts of polyacrylamide and 5-10 parts of a propylene-acrylamide copolymer. Compared with the prior art,the protective film provided by the invention has the stable viscosity and good antistatic performance simultaneously, and can be used for packaging of electronic components.

The invention discloses a glue-coated medical device packaging material that can be peeled off stably and cleanly. The main resin of the resin layer and the glue layer is a water-based adhesive. The invention also discloses its preparation method; the invention is suitable for pressure steam and ethylene oxide sterilization methods, and the sterilized items have a long shelf life, which ensures product quality and safety for clinical application; excellent barrier performance, reduces metal The incidence of rust and other losses of similar items can be reduced, and the service life of the items can be extended; the stable and easy-peel sealing effect after sterilization reduces the labor intensity of the nursing staff.

Disclosed is a cover tape which comprises at least a base layer (A), an intermediate layer (B), a peeling layer (C), the primary component of which is a thermoplastic resin, and a heat seal layer (D), the primary component of which is a thermoplastic resin that can be heat sealed to a carrier tape. The tensile storage modulus (c) of the thermoplastic resin that constitutes the peeling layer (C) is within the range of 1×106 Pa to 1×108 Pa. The tensile storage modulus (d) of the thermoplastic resin that constitutes the heat seal layer (D) is within the range of 1×108 Pa to 1×1010 Pa. The ratio of (c) and (d) satisfies 1×104≧(d) / (c)≧1×10. This kind of cover tape has the appropriate peel strength and sufficiently low fluctuation in peel strength when heat sealed to a thermoplastic resin carrier tape. Therefore, the tape will not tear even under shock caused by high-speed peeling, and sticking of electronic parts does not occur even when set aside for a long period of time of 24 to 72 hours in a high-temperature environment of 60 to 80° C.

The present invention provides a cover film which is stable in peel strength continuously within a predetermined value range when the cover film is peeled off, excellent in transparency, and less prone to "film breakage" during high-speed peeling. To provide a cover film comprising at least (A) a substrate layer and (B) an adhesive layer, (C) an intermediate layer and (D) a heat-sealing layer having a heat-sealable resin, (B) a The main agent is polyester resin, 50% by mass or more of the curing agent is isophorone diisocyanate, and (D) the heat sealing layer contains: 50-90% by mass of (d-1) olefin-based resin and 10-40% by mass % (d-2) a potassium ion polymer with antistatic properties, the (d-1) olefin-based resin comprises: an olefin-styrene block copolymer containing 58-82 mass % of an olefin component and an olefin-styrene block copolymer containing 75- Any one or more of ethylene-vinyl acetate copolymers containing 88% by mass of olefin content.

The invention relates to a water-based polyurethane dispersion and a one-component water-based adhesive for PVC calendering coating including the water-based polyurethane dispersion. The adhesive balances soft feel and bond strength. The water-based adhesive is composed of the following components: water-based polyurethane dispersion, water-based leveling agent, water-based wetting agent, water-based defoamer, pH regulator, and thickener. The invention also relates to a roll coating process used for the one-component water-based adhesive for the calendering coating. The one-component water-based adhesive for PVC calendering coating disclosed by the present invention can be used for compounding PVC paste and textile substrates, including scraping and roller coating processes, and the prepared PVC calendering coating has very high initial bonding strength. Peel strength after stabilization, resistance to plasticizers and high jungle resistance, can be widely used in packaging bags, raincoats, tablecloths, curtains, etc.