Strippable multilayer-structure surface protective film and product thereof

A technology of surface protection film and matrix layer, applied in the direction of heat-activated film/sheet, film/sheet adhesive, transportation and packaging, etc.

Inactive Publication Date: 2010-11-24
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the peel strength of the protective film when peeled can be controlled by the initial peel strength for some specific applications, for most applications, the increase or decrease of the peel strength will produce undesired properties

Method used

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  • Strippable multilayer-structure surface protective film and product thereof
  • Strippable multilayer-structure surface protective film and product thereof
  • Strippable multilayer-structure surface protective film and product thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0088] The preparation method of the adhesive composition can adopt any method known in the art. For example, the components may be dry blended followed by melt compounding in a twin-screw extruder. For example, the components can be melt mixed in a twin-screw extruder using a melt temperature of 180-230°C.

[0089] The melt flow index of the blended composition is 0.5-20g / 10min. In order to obtain good processing properties, especially blown film processing, the melt flow index is preferably lower than 15g / 10min (such as 1-14g / 10min, preferably 1.5-13g / 10min), more preferably lower than 10g / 10min ( For example 1.8-10g / 10min, preferably 2-8g / 10min).

[0090] The preparation method of the peelable surface protection film is not particularly limited. The compositions described above can be prepared and applied using a variety of methods and techniques. For example, the adhesive composition may be formed into a film using cast or blown extrusion techniques, and the adhesive f...

Embodiment 1

[0105] This example illustrates the effect of the addition of LDPE on the aging stability of the final peel strength

[0106] In a 20-mm Brabender twin-screw extruder, 4.11 kg of ethylene-vinyl acetate copolymer (25% by weight vinyl acetate, melt flow rate of 2.0 g / 10 min, melting point of about 77 ° C), 3.23 kg of ethylene-vinyl acetate Vinyl acetate copolymer (28% by weight vinyl acetate, melt flow rate is 6.0g / 10min, about 69 ℃ of fusing points), 2kg maleic anhydride grafted ethylene-vinyl acetate copolymer (28% by weight vinyl acetate , melt flow rate is 1.4g / 10min), 500g hydrogenated hydrocarbon resin tackifier ( 1125, available from Eastman Chemical Company), 10g of antioxidant (anox TM 20N (trade name available from Chemtura) and 3.3 kg of low density polyethylene (density 0.923, melt flow index 2.0 g / 10 min) were melt mixed. The extruder screws are set so that all components are melted / kneaded and properly dispersed. Set the processing zone temperature at 130-190...

Embodiment 2

[0114] This example illustrates the effect of the addition of LDPE on the aging stability of the final peel strength

[0115] In a 20-mm Brabender twin-screw extruder, 4.11 kg of ethylene-vinyl acetate copolymer (25% by weight vinyl acetate, melt flow rate of 2.0 g / 10 min, melting point of about 77 ° C), 3.23 kg of ethylene-vinyl acetate Vinyl acetate copolymer (28% by weight vinyl acetate, melt flow rate is 6.0g / 10min, about 69 ℃ of fusing points), 2kg maleic anhydride grafted ethylene-vinyl acetate copolymer (28% by weight vinyl acetate , melt flow rate is 1.4g / 10min), 500g hydrogenated hydrocarbon resin tackifier ( 1125, available from Eastman Chemical Company), 10g of antioxidant (anox TM 20N (trade name available from Chemtura) was melt mixed with 1.1 kg of low density polyethylene (density 0.923, melt flow index 2.0 g / 10 min). The extruder screws are set so that all components are melted / kneaded and properly dispersed. Set the processing zone temperature at 130-190...

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Abstract

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.

Description

technical field [0001] The invention relates to a peelable multilayer structure surface protection film, which can be used to protect the surfaces of building decoration materials, automobiles, household appliances and the like. Background technique [0002] Metal plates (such as color-coated steel plates, stainless steel plates, aluminum plates, etc.), polymer material panels, glass, etc., which have undergone various surface treatments (such as surface polishing, coating, paint and micro-etching treatment, etc.), can be used as building decoration materials, Automotive panels, household appliances panels, etc. In order to prevent it from being damaged, polluted and / or corroded during transportation and installation, a surface protection film is usually used to protect its surface. It is required that such a surface protection film can be easily applied to the surface with a certain tack and remain adhered until peeled off, and that the applied peel force should not leave ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J123/08C09J7/22C09J7/35
CPCC09J2451/00C08L23/06C08L23/0853C08L23/04C09J2431/00C09J7/0242C08L23/0869C09J2423/00C08L23/02C08L23/10C09J7/35C09J7/22Y10T428/2826C08L2666/06
Inventor 任世杰
Owner EI DU PONT DE NEMOURS & CO
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