JP2002146143A - Formulation of polyvinyl alcohol resin coating agent in oriented film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesion of a polyvinyl alcohol resin to an oriented film. SOLUTION: The adhesion of a polyvinyl alcohol resin to an oriented film such as of polyolefin, polyester or polystyrene is improved by compounding polyvinyl alcohol and a modified polyvinyl alcohol resin with 1-30 pt(s).wt. of a polyvinyl alcohol resin modified with a dibasic acid salt and 0-20 pt(s).wt. of an isocyanate.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND ART A barrier packaging material coated with a polyvinyl alcohol resin is used as a coat film instead of a PVDC-coated barrier packaging material.

[0002]

2. Description of the Related Art When coating is performed by adding an isocyanate to a polyvinyl alcohol resin, a stretched film of polyolefin, polyester, polystyrene or the like is subjected to an easy adhesion treatment and coated off-line.

[0003]

A stretched film of polyolefin, polyester, polystyrene or the like is coated with a polyvinyl alcohol resin by performing an easy adhesion treatment. Even if the easy adhesion treatment is performed, the coating film is peeled off because the adhesion is weak.

[0004]

Means for solving the problems Polyolefin, by mixing a dibasic acid salt modified polyvinyl alcohol resin,
Increases adhesion to stretched films such as polyester and polystyrene. As a result, the adhesion is improved without performing the easy adhesion treatment, and the inline coating can be performed. Furthermore, it is also possible to further increase the adhesiveness by using an isocyanate as an auxiliary agent. As the antiblocking agent, an organic fine particle polymer or an inorganic filler is effective.

[0005]

EXAMPLES A 12% aqueous solution of a polyvinyl alcohol resin, a polyvinyl alcohol resin, and a dibasic acid salt-modified polyvinyl alcohol were prepared. This was used to prepare the following formulation 1 at a solid content ratio. Formulation 1 Polyvinyl alcohol 95 parts Dibasic acid salt modified polyvinyl alcohol 5 parts PMMA fine particle polymer 0.3 part Formulation 2 was prepared in the same manner. Formulation 2 Modified polyvinyl alcohol 95 parts Dibasic acid salt modified polyvinyl alcohol 5 parts PMMA fine particle polymer 0.3 part Formulation 3 was prepared in the same manner. Formulation 3 Polyvinyl alcohol 95 parts Dibasic acid salt modified polyvinyl alcohol 5 parts Isocyanate 1 part PMMA fine particle polymer 0.3 part Similarly, Comparative 1 was prepared. Comparative 1 Polyvinyl alcohol 99 parts Isocyanate 1 part PMMA fine particle polymer 0.3 part The above Formulations 1 to 3 and Comparative 1 were coated on polyester and polypropylene films, respectively, and adhesion and stretchability were checked. The results shown in Table 1 were obtained.

[0006]

EFFECT OF THE INVENTION By blending a dibasic acid salt-modified polyvinyl alcohol, the adhesiveness is improved and in-line coating becomes possible.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 3/00 C08K 3/00 5/29 5/29 C08L 101/00 C08L 101/00 // C09J 129 / 04 C09J 129/04 F term (reference) 4F006 AA12 AA15 AA35 AB20 AB37 AB54 BA01 DA05 4J002 BE021 BE022 BG063 ER007 FD203 FD206 GH00 4J034 BA07 DA01 DB03 DB07 DP02 DP06 DP17 MA01 MA21 RA05 RA08 4J040 DD021 DN001 EL05 MA05 4J100 AD02P CA01 CA31 HC28 JA01 JA03

Claims (3)

[Claims] 1 to 30 parts of a polyvinyl alcohol resin modified from a polyvinyl alcohol and a modified polyvinyl alcohol resin with a dibasic acid salt, and 0 to 30 parts of an isocyanate.
By mixing 20 parts, the adhesiveness to a stretched film such as polyolefin, polyester, and polystyrene is improved. 2. It is effective for both in-line coating and off-line coating. 3. An organic fine particle polymer or an inorganic filler is added as an antiblocking agent. [0001]