Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1995-09-20
1997-11-11
Mosley, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528176, 528194, C08G 6302
Patent
active
056865520
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This Application is a 371 of PCT/JP95/00105 filed Jan. 27, 1995.
The present invention relates to a polyester composition having excellent hydrolysis resistance, to polyester monofilaments and to a process for their production, as well as to products such as industrial fabrics which employ the polyester monofilaments.
BACKGROUND ART
The excellent properties of polyesters have led to their use in various types of industrial parts, clothing and industrial fiber materials, various types of fabrics, etc. However, since polyester resins have the disadvantage of degradation due to hydrolysis undergone in high-temperature and high humidity environments, a variety of different improvements have been applied. For example, polyester compositions with humidity resistance improved by the incorporation of acid-modified polyolefins and epoxy-modified acryl resins have been proposed (Japanese Unexamined Patent Publication (Kokai) No. 63-39956), but the effect of improvement in humidity resistance is insufficient. Furthermore, since polyester monofilaments have excellent tensile strength, acid resistance and dimensional stability, they have found extensive use in papermaking drier canvases, papermaking wire, various brushes, writing brushes, plain gauze for printing screens, fishing lines, rubber-reinforcing fiber materials, and the like. However, when used under conditions such as-high heat and moisture which promote hydrolysis, as when employed as a structural material or tire cord, or in a papermaking drier canvas, polyester monofilaments undergo a reduction in strength due to hydrolytic degradation, and therefore they have not been able to withstand long-term use. As a result, a number of methods have been proposed for eliminating the drawbacks of such polyester monofilaments.
One known means of improving the resistance to hydrolysis of polyester monofilaments is the production of monofilaments using a polyester containing a specific amount of a polyolefin such as polyethylene, polypropylene, polybutene, poly-4-methylpenten-1 or polystyrene (Japanese Unexamined Patent Publication (Kokai) No. 51-136923), but the monofilaments obtained by this technique, for example monofilaments comprising polyethylene-containing polyethylene terephthalate, have low strength and a low effect of improvement in resistance to hydrolysis, and are thus impractical.
There are also known methods of improving resistance to hydrolysis of polyesters by the addition of epoxy compounds. Such known methods include a method of adding a monoglycidyl ether to polyester (Japanese Examined Patent Publication (Kokoku) No. 44-27911), a method of adding a glycidyl phthalimide to polyester (Japanese Examined Patent Publication (Kokoku) No. 61-4843), a method of adding an epoxy compound to polyester in the presence of an alkali metal salt (Japanese Unexamined Patent Publication (Kokai) No. 51-134789) and a method of adding an epoxy compound to polyester in the presence of an alkaline earth metal salt (Japanese Examined Patent Publication (Kokai) No. 61-42728), and although these provide the effects of improving resistance to hydrolysis, the excellent resistance to hydrolysis presently sought has not been satisfied.
There are also known methods of improving the resistance to hydrolysis of polyesters by the addition of oxazoline compounds. For example, there are known methods of adding specific oxazolines to polyesters (Japanese Examined Patent Publication (Kokoku) Nos. 63-8133, 61-48531, 61-57182, 61-48532 and Japanese Unexamined Patent Publication (Kokai) No. 57-161122), and although these provide the effects of improving resistance to hydrolysis, the excellent resistance to hydrolysis presently sought has not been satisfied.
There are also known methods of improving the resistance to hydrolysis of polyesters by the addition of carbodiimide compounds. For example, there have been proposed various methods including a method of adding a mono- or bis-carbodiimide compound and rapidly mixing and spinning to form filaments which contain no unr
REFERENCES:
patent: 3975329 (1976-08-01), Barnewall et al.
Horii Yoshinori
Iwama Tadanori
Masuda Toyohiko
Miller Austin R.
Mosley Terressa
Toray Industries Inc.
Toray Monofilament Co., Ltd.
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