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公开(公告)号：US20190309158A1
公开(公告)日：2019-10-10
申请号：US16301565
申请日：2017-04-12
Applicant: Polyplastics Co., Ltd.
Inventor： Tadahiro HORIGUCHI , Sonae KOTANI , Kazuki OHI
Abstract: A polyacetal resin composition suitable for providing a plate-shaped resin molded article that satisfies all of the following: high flatness, low shrinkage ratio anisotropy (high dimensional stability), high creep resistance, high impact strength, and excellent color stability during residence in the molding machine. The polyacetal resin composition for molding a plate-shaped molded article includes 100 mass parts of a polyacetal resin having a melt index (according to ASTM D1238, 190° C., 2.16 kgf) of 2.0 g/10 min to 4.0 g/10 min; 0.1 mass parts to 2 mass parts of a polyacetal copolymer that is a copolymer of (b1) trioxane, (b2) a compound having two to four cyclic ether units per one molecule, and (b3) a compound having one cyclic ether unit per one molecule, the polyacetal copolymer having a branched or crosslinked structure; and 0.1 mass parts to 1 mass part of a hindered phenol antioxidant.
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公开(公告)号：US20170073451A1
公开(公告)日：2017-03-16
申请号：US15119561
申请日：2014-12-10
Applicant: Polyplastics Co., Ltd.
Inventor： Tadahiro HORIGUCHI , Eiji MASUDA
Abstract: A process for producing a polyacetal copolymer, the process making catalyst deactivation easy and efficient. Trioxane as a major monomer is copolymerized with one or more comonomers that are a cyclic ether and/or cyclic formal having at least one carbon-carbon bond, using a nonvolatile protonic acid as a polymerization catalyst at 100° C. or lower until the conversion reaches 50% and thereafter at a polymerization environment temperature of 115° C. to 140° C. This process includes: a crushing step in which a dry-process crusher is used to obtain a crude polyacetal copolymer crushed to such a degree that when the crude copolymer is screened with a sieve having an opening size of 11.2 mm, 90 parts by weight or more thereof passes therethrough; and a deactivation step in which a basic compound (e) is added to the crude copolymer and the mixture is melt-kneaded to thereby deactivate the polymerization catalyst.
Abstract translation: 一种生产聚缩醛共聚物的方法，使催化剂失活的方法简单高效。 作为主要单体的三恶烷与一种或多种作为具有至少一个碳 - 碳键的环醚和/或环状缩甲醛的共聚单体共聚，使用非挥发性质子酸作为聚合催化剂，在100℃以下直至转化 达到50％，之后在115℃至140℃的聚合环境温度下进行。该方法包括：破碎步骤，其中使用干法破碎机获得粗聚缩醛共聚物，该聚缩醛共聚物被粉碎至如 粗共聚物用开口尺寸为11.2mm的筛子筛选，其中90重量份以上通过; 以及将碱性化合物（e）加入到粗共聚物中并使混合物熔融捏合以使聚合催化剂失活的失活步骤。
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公开(公告)号：US20170349742A1
公开(公告)日：2017-12-07
申请号：US15538008
申请日：2015-11-09
Applicant: Polyplastics Co., Ltd.
Inventor： Tadahiro HORIGUCHI , Akihide SHIMODA
IPC: C08L59/04
CPC classification number: C08L59/04 , C08G2/20 , C08L2205/025
Abstract: A polyacetal resin composition which is suppressed low in formaldehyde generation, while having high stiffness and high toughness. The resin is produced by a method including blending from 0.1 part by weight to 2 parts by weight (inclusive) of a polyacetal copolymer having a branched or crosslinked structure, which is a copolymer of a trioxane, a compound having from 3 to 4 (inclusive) cyclic ether units in each molecule and a compound having one cyclic ether unit in each molecule, per 100 parts by weight of a linear polyacetal copolymer which contains an oxymethylene unit as a main constituent, while containing, as a comonomer unit, an oxyalkylene unit at a ratio of from 0.4% by mole to 0.9% by mole (inclusive) relative to the constituents of the linear polyacetal copolymer, the linear polyacetal copolymer being obtained by copolymerization wherein a heteropolyacid or the like is used as a polymerization catalyst.
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