Additive for synthetic resins and synthetic resin compositions

Details Additive for synthetic resins and synthetic resin compositions Additive for synthetic resins and synthetic resin compositions

1998-01-12

1998-12-01

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

521 54, 428403, 428694BA, C08J 932, B32B 516

Patent

active

058440224

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an additive for synthetic resins comprising particles that are surface-coated with a specific form of petaloid porous hydroxyapatite, and a synthetic resin composition containing the particles. The purpose of the present invention is to provide an additive that is used for synthetic resins such as polyolefin and polyester, and that can exhibit a superior preventing ability against blocking of, for example, a synthetic resin film, and a synthetic resin fiber, and a synthetic resin composition containing the additive.


BACKGROUND ART

Synthetic resins are widely used in various industrial fields. Among the synthetic resins, an industrially manufactured polyester, especially polyethyleneterephtalate (hereinafter referred to as PET) has superior physical and chemical features and is used as fibers, films, and other molded articles. For example, in a film area, the polyester is used for magnetic tapes such as audiotapes and videotapes, condensers, photographs, wrappings, OHP, pre-paid cards and so on.
Slipperiness and anti-shavingness of the polyester film are main features that control workability in a manufacturing step or a processing step of the film in various uses, and a quality of a product. In a case where a magnet layer is coated on a surface of the polyester film so as to use as a magnetic tape, if the slipperiness and anti-shavingness of the film are not sufficient, a friction between coating rolls and the surface of the film becomes large, thereby causing a severe abrasion of the surface of the film, and in an extreme case, resulting in wrinkles and scratches on the surface of the film. Even after processing the film into a tape such as audiotapes, videotapes and computer-tapes by slitting the film which is coated with the magnetic layer, an extreme friction between the surface of the film and many guides or a reproduction head will occur during operations such as drawing out of the tape from a reel or cassette, winding the tape and so on. This extreme friction causes scratches or strain, and the shaving of the surface of the polyester film deposits white powder, and results in a lack of magnetic recording signal, namely, drop-out.
For lowering a friction coefficient of the polyester, many methods for improving slipperiness of the surface of the molded articles are proposed by incorporating inorganic fine particles into polyester so as to give minute and appropriate roughness to the surface of the molded articles of the polyester. However, since affinity between the fine particles and the polyester is not sufficient, both transparency and anti-abrasion ability of the film are not satisfactory.
In case of a polyolefin, the polyolefin is widely used in various industrial fields. Especially, a polyolefin film such as a polypropylene film is the most widely used as various wrapping materials. Since it is known that such kind of the polyolefin film is adhesive, the polyolefin film tends to cause blocking. For this reason, workability in a process for manufacturing or processing of the film becomes worse. Furthermore, in a case where the film is used in packaging or wrapping, troubles such as less workability in opening the package or wrapping tend to occur. Therefore, in general, an anti-blocking treatment is done on this kind of film. As an anti-blocking agent, a finely powdered silicic acid, zeolite, calcium carbonate and kaolin cray are typically known and used.
On the other hand, the polyolefin film requires, as qualitative features, superior transparency and good anti-scratch ability (For example, the surface of the film is less scratched when the surface of the film is contacted with each other.). However, the transparency and the anti-scratch ability, are contrary to the anti-blocking ability. For example, in order to improve the anti-blocking ability of the polyolefin film, if a large amount of the blocking agent is used, the anti-scratch ability and the transparency become poorer as an amount of the blocking agent to be added is increased. There

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