JPS61250082A - Tape or film for masking - Google Patents

Abstract

PURPOSE:The titled tape for coating, etc., having improved adhesivity and heat resistance free from paste residue in repeated release, obtained by forming a pressure-sensitive adhesive layer consisting of a specific crosslinked polyester and an adhesion imparting resin in a specific ratio on one side of a polyester substrate. CONSTITUTION:(A) 100pts.wt. polyether having a main chain which contains one or more hydrolyzable silicon groups (e.g., hydride group bonded to silicon group) and a repeating unit substantially shown by the formula -R-O- (R is bifunctional alkyl, preferably 1-4C alkylene) and (B) 40-150pts.wt. adhesion imparting resin (e.g., terpene-phenolic resin, etc.) are dissolved in a solvent such as toluene, etc., applied to one side of a polyester substrate and crosslinked under heating oat 120 deg.C for 1 - several minutes to give the aimed tape. Preferably the surface of the substrate to be coated as is subjected to corona discharge and a long-chain alkyl group-containing releasant is used on the back.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive tape or film used for applications such as painting masking.

[Conventional technology]

BACKGROUND ART It is well known that adhesive tapes or films used for applications such as paint masking use natural rubber or synthetic rubber as the adhesive base. Also,
Some use acrylic polymers (Special Publication No. 1972-
Publication No. 773).

[Problem that the invention seeks to solve]

By the way, in products using the above-mentioned rubber as the base of the adhesive, the adhesive is generally crosslinked in order to improve heat resistance and solvent resistance, but crosslinking tends to reduce adhesive properties, and this can be improved. For this purpose, softeners, fillers, etc. are added, but this required technical consideration to strike a balance between heat resistance and adhesive properties.

Furthermore, softeners, release agents, and the like may cause a bleeding phenomenon on the surface of the adhesive layer and contaminate the adherend after attachment.

In addition, adhesives that use acrylic polymers as the base exhibit a large degree of adhesion after being applied to an adherend, and have a heavy peeling force upon re-peeling.1. It has the disadvantage of leaving adhesive residue.

The present invention was made in an attempt to solve such problems such as adherend contamination and adhesive residue, and to provide a heat-resistant masking tape or film that can withstand high temperatures of 70 to 160°C.

[Means for solving problems]

The masking tape or film of the present invention contains at least one hydrolyzable silicon group on one side of a polyester base material, and the main chain is essentially of the formula -R-0- (R is a divalent alkylene group). The adhesive layer is composed mainly of a component in which 40 to 150 parts by weight of a tackifier resin is blended with 100 parts by weight of a polyether having the chemically bonded repeating units shown, and the adhesive layer is crosslinked with the polyether. It is characterized by being formed.

In this invention, the hydrolyzable silicon group in the polyether is a hydride group bonded to a silicon atom, a halogen group,
These include an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an aminooxy group, an alkenyloxy group, an alkenyloxy group, a mercapto group, and the like.

Further, R in the main chain of the polyether is a divalent alkylene group, and preferably has 1 to 4 carbon atoms.

In addition, in this invention, the adhesive resin is compatible with polyether, and includes rosin-based resins such as rosin, rosin ester, and hydrogenated rosin, phenol resin, and terpene resin.
Examples include modified phenol resins such as phenol resins, xylene resins, petroleum resins, terpene resins, and chroman resins. The amount added is 5.0 parts per 100 parts by weight of polyether. ~140 parts by weight.

In addition to the above-mentioned adhesive resin, additives used in ordinary solvent-free adhesive resin compositions, such as anti-aging agents, pigments, plasticizers, etc., can be added as necessary.

In order to form such an adhesive composition on a polyester base material, a so-called true melt coating method, in which it is dissolved in a solvent and applied and dried, or it is heated and melted and applied, is employed. Crosslinking of the polyether component of the adhesive is then achieved by heating in the presence of moisture.

Heating for one to several minutes at around 120°C is usually required.

In addition, when applying the adhesive layer, it is preferable to perform a treatment such as corona treatment or undercoating on the coated surface of the polyester tape or film as the base material in advance in order to improve the adhesive strength with the adhesive.

In addition, for mold release treatment applied to the back side of the base material, silicone-based adhesives tend to be difficult to release, so non-silicon-based release agents such as fluorine-based mold release agents, long-chain alkyl A group-containing type of mold release agent, particularly the latter long-chain alkyl group-containing type of mold release agent, is preferably used.

〔Example〕

100 parts by weight of polyether (MS Polymer #300, Kanebuchi Kagaku Kogyo Co., Ltd.), adhesive resin (YS Polyster T-11)
5 terpene-phenolic adhesive resin, Yasuyu Co., Ltd.) 70
A formulation consisting of 3.0 parts by weight, UV inhibitor and anti-aging agent was dissolved in a solvent (30 parts by weight of toluene and 10 parts by weight of methanol), and this was mixed into a polyester film (thickness 38 μm) which had been corona treated on one side. ) was coated on the corona-treated surface, and crosslinked by heating at 120° C. for 10 minutes.

This masking film had excellent properties as shown below.

(Adhesive properties) The adhesive properties of the masking film of the present invention (total thickness: 61μ, glue thickness: 23μ) obtained in this way are as follows: tack force (
1/32 inch); 7, sp adhesive strength (g/19);
750, developing force (g/19); 80, SP retention force; 2 hours or more.

In addition, the SP holding power is determined by applying two adhesive films to a stainless steel plate.
After pasting with a pasting area of 5 x 25 cranes and crimping once with a 2 kg rubber roller, a 1 kg load is attached to the end, and the time until the load falls in a constant temperature room at 23 ± 2 ° C and 65% RH. Indicated by

(Heat resistance) The adhesive film of the present invention obtained in the above experiment and a polyester tape using a general rubber adhesive commercially available as a paint masking film as a comparative example were
Paste each on a stainless steel plate and heat at 140°C for 60 minutes for 15 minutes.
After being left at 0°C for 60 minutes and 160°C for 60 minutes, the tape was cooled to room temperature, and the peeling condition of the tape was checked.The stainless steel plate was tested using a Schopper type tensile tester at a speed of 300m/min to perform a 180" square beer test. The state of the adhesive remaining on the was observed.

The results were as shown in Table 1.

(The following is a blank space) Table 1 (Solvent resistance) The adhesive film of the present invention obtained in the above experiment and a polyester tape using a general rubber adhesive commercially available as a paint masking film as a comparative example were
Paste each on a stainless steel plate and soak in toluene for 10 minutes and 30 minutes.
After immersing the stainless steel plate for 20 minutes, a beer test was conducted in the same manner as before to observe the state of the adhesive remaining on the stainless steel plate.

The results were as shown in Table 2.

Table 2 (Paint baking test) The adhesive film of the present invention obtained in the above experiment and a polyester tape using a general rubber adhesive commercially available as a paint masking film as a comparative example were
Each was pasted on a stainless steel plate, sprayed with modified acrylic paint, pre-dried at 80°C for 10 minutes, then 150x
Baking was carried out for 30 minutes at 170°C for 30 minutes, and the state of peeling of the film was observed, and the same beer test as before was conducted to observe the presence or absence of adhesive residue and the linearity of the lines.

The results were as shown in Table 3.

(The following is a blank space) Table 3 [Operations and effects of the invention] As described above, in this invention, the base material is polyester, the adhesive layer is small (contains one hydrolyzable silicon group, and the main chain is 40 to 150 parts by weight of a tackifier resin is blended with 100 parts by weight of a polyether having chemically bonded repeating units essentially represented by the formula -R-0- (R is just 2 alkylene groups) The masking tape or film is mainly composed of the above-mentioned polyether and cross-linked with the above-mentioned polyether, so it maintains appropriate adhesiveness, leaves no adhesive residue even when re-peeled, and provides a useful masking tape or film with excellent heat resistance. can.

Therefore, the masking tape or film of the present invention can be used for purposes other than painting masking, such as protection tape, temporary fixing tape (fixing refrigerator doors, etc.)
It is also suitably used in fields where heat resistance and removability are required, such as tapes for printing materials and plated masking tapes.

Claims (1)

[Claims] 1. One side of the polyester base material contains at least one hydrolyzable silicon group, and the main chain essentially has the formula -R-O-(R
The main component is a component in which 40 to 150 parts by weight of a tackifier resin is blended to 100 parts by weight of a polyether having a chemically bonded repeating unit represented by a divalent alkylene group; A masking tape or film comprising a cross-linked adhesive layer.