JP3281935B2 - Method for producing sheet-like material comprising polyolefin resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sheet made of a polyolefin resin having excellent calendarability.

[0002]

2. Description of the Related Art Conventionally, a sheet-like material comprising a polyolefin resin composition has generally been processed and produced by an extrusion method or an inflation method.

[0003]

However, in these extrusion methods and inflation methods, the production discharge amount is small,
It is difficult to adjust the width and the like, and according to these methods, there is a drawback that the sheet is liable to have scratch marks on the sheet and rub marks caused by the eyes and dirt on the sheet during processing, so that the surface is rough.

[0004] Therefore, it is desired to employ a calendering process which has a large production discharge amount, is easy to control the width and the like, and has no fear of roughening of the surface during processing. (1) Adhesion (slipperiness) with the roll surface (2) Heat-resistant discoloration (3)
It was not suitable for calendering due to a problem with the calender temperature.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide an ethylene-methyl methacrylate copolymer which has been unsuitable for calendering. And to provide a sheet having excellent smoothness.

[0006]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies, and as a result, adjustment of the melt index value, adjustment of the roll temperature, etc. have been carried out by calendering the ethylene-methyl methacrylate copolymer. The present inventors have found that the present invention is most suitable for providing excellent suitability, and is most suitable for providing a sheet-like material having excellent smoothness, thereby completing the present invention.

That is, according to the present invention, there is provided a sheet-like material characterized in that ethylene-methyl methacrylate having a melt index adjusted to 0.5 to 5.0 g / 10 min is calendered at a roll temperature of 140 to 200 ° C. It is a manufacturing method.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in which the melt index of an ethylene-methyl methacrylate copolymer is adjusted to 0.5 to 5.0 g / 10 min. Acrylic processing aid, organic acid metal salt, organic fatty acid alone or a blend of two or more of these are added to the resin, and the amount of addition is 0.005 to 10 parts by weight based on 100 parts by weight of the resin. ,
Preferably it is 0.01 to 3 parts by weight.

The value of the melt index is 0.5 to
Adjusted to 5.0g / 10min (JIS K-6730-1981
), If the value is lower than 0.5 g / 10 min, the calender temperature must be increased more than necessary because it is too hard, and the danger increases. On the other hand, if the value is higher than 5.0 g / 10 min, the tackiness becomes too high. Since the adhesive easily adheres to the roll, the calendering temperature cannot be increased to a predetermined temperature, and as a result, the smoothness of the sheet cannot be obtained.

Acrylic processing aids added to the above copolymers or blends thereof include acrylic acid such as acrylic acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and 2-ethylhexyl acrylate. Ester, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, and other copolymers containing methacrylic acid ester as a main component. Specifically, for example, commercially available products manufactured by Mitsubishi Rayon Co., Ltd. METABLEN P-700, METABLEN P-551, METABLEN P-530A, METABLEN L-1000, KANEACE PA-20, KANEACE PA-100, manufactured by Kanegabuchi Chemical Industry, Mark LS-3, Mark LS-5 manufactured by Asahi Denka Kogyo And so on.

The organic acid metal salts are higher fatty acid salts of metals such as zinc stearate, zinc laurate, zinc oleate, barium stearate, calcium stearate, dibutyltin laurate, dibutyltin stearate, dibutyltin dilaurate, And dibutyltin distearate.

The organic fatty acids are, for example, stearic acid, oleic acid, lauric acid, palmitic acid and the like.

The processing aids added to the ethylene-methyl methacrylate copolymer are the above-mentioned acrylic processing aids,
The organic acid-based metal salt and the organic fatty acid are used alone or in a mixture of two or more kinds in an amount of 0.005 to 10 parts by weight per 100 parts by weight of the resin. Copolymer of ethylene and vinyl acetate, ethylene, propylene, butene, butene-1,3-methyl-butene-1, hexene-1, octene-1,4-methyl-
Other polymers such as high-density polyethylene, medium-low-density polyethylene, ultra-low-density polyethylene, crystalline polypropylene, polybutene, and the like; Antistatic agents well known in various technical fields,
It is also possible to add an ultraviolet absorber, an antioxidant, a pigment, an antiblocking agent and the like.

The appropriate temperature range for calendering is from 140 to 200 ° C., preferably from 150 to 180 ° C., depending on the type and amount of these blends and processing aids.

Next, specific examples will be described. Example 1 Melt index values were adjusted as shown in Table 1 below, for example, 100 weight% of each of ethylene methyl methacrylate copolymer and ethylene-ethyl acrylate copolymer. Parts by weight, a processing aid (Mark LS-5) was added in an amount of 0.5 part by weight, and the resulting mixture was calendered at a roll temperature shown in Table 1 below to evaluate roll lubricity and sheet smoothness. It is shown in FIG.

[0016]

[Table 1]

Each of the above embodiments is merely an example.
Tests were also conducted when processing aids such as Metablen L-1000, zinc stearate, Kaneace PA-100, etc. were added instead of S-5. As a result of the evaluation, a similar evaluation was obtained.

[0018]

According to the method for producing a sheet-like material of the present invention, ethylene-methyl methacrylate having a melt index adjusted to 0.5 to 5.0 g / 10 min is prepared by applying a roll temperature of 14 to
Calendering is performed at 0 to 200 ° C. As a result, an ethylene-methyl methacrylate resin composition excellent in calendarability can be obtained. Then, calendering which is a condition for forming a sheet-like material made of the same resin composition, increases the production discharge amount, easily controls the width and the like, and has no fear of roughening of the surface skin at the time of processing. Can be adopted.

Therefore, since this is a method for producing a sheet-like material in which ethylene-methyl methacrylate is calendered at a roll temperature of 140 to 200 ° C., the production discharge point, width, etc. by the extrusion method and the inflation method are different from the conventional method. It is possible to provide a sheet having excellent smoothness by using the ethylene-methyl methacrylate resin composition by eliminating the difficulty of adjustment and the disadvantages such as roughening of the sheet surface by these methods.

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI B29L 7:00 B29L 7:00 C08L 33:04 C08L 33:04 (56) References JP-A-4-81440 (JP, A) JP-A-Hei 3-123422 (JP, A) JP-A-63-75013 (JP, A) JP-B-7-103277 (JP, B2) Handbook of Plastics Processing Technology (New Edition), pp. 323-324, July 1984 Published by Nikkan Kogyo Shimbun on October 10 (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J 5/18 B29C 43/24 C08F 220/18 C08L 33/04

Claims (1)

(57) [Claims] 1. The melt index value is set to 0.5 to 5.
A method for producing a sheet material, comprising calendering an ethylene-methyl methacrylate copolymer adjusted to 0 g / 10 min at a roll temperature of 140 to 200 ° C.