Process for producing polyacetal resin composition
US-10577496-B2 · Mar 3, 2020 · US
Method for producing polyoxymethylene resin composition
US2016237221A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016237221-A1 |
| Application number | US-201415027084-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 9, 2014 |
| Priority date | Nov 21, 2013 |
| Publication date | Aug 18, 2016 |
| Grant date | — |
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Abstract
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A polyoxymethylene resin composition from which formaldehyde is generated in a reduced amount upon molding, without carrying out a stabilization treatment for stabilizing an unstable terminal group in a crude oxymethylene copolymer. A hindered phenol-type antioxidant agent and an ethylene-(methacrylic acid) copolymer resin or an ethylene-(acrylic acid) copolymer resin or a salt thereof are melted and kneaded together to produce a polyoxymethylene resin composition without carrying out a stabilization treatment for stabilizing an unstable terminal group in a crude oxymethylene copolymer for which a polymerization catalyst is deactivated after the completion of copolymerization and in which the unstable terminal group is not yet stabilized. When the polyoxymethylene resin composition is extrusion-molded, the discoloration of a molded product or the deterioration in properties of the molded product can be prevented for a long period of time. The resulting polyoxymethylene resin composition is suitable for forming an extrusion-molded article.
First claim
Opening claim text (preview).
1 . A method of producing a polyoxymethylene resin composition wherein a crude oxymethylene copolymer for which a polymerization catalyst has been deactivated after completing the copolymerization but for which unstable terminal groups have not been stabilized, is melt-kneaded with a hindered phenol-type antioxidant, an ethylene-methacrylic acid copolymer resin or an ethylene-acrylic acid copolymer resin or a salt thereof, and an alkaline earth metal compound, without carrying out a stabilization treatment to stabilize the unstable terminal groups. 2 . A method of producing a polyoxymethylene resin composition according to claim 1 , wherein the alkaline earth metal compound is an aliphatic carboxylic acid metal salt or an oxide. 3 . A method of producing a polyoxymethylene resin composition according to claim 1 , wherein the alkaline earth metal compound is calcium stearate, and further, the calcium stearate is used in a range of 0.003 mass % to 0.020 mass % with respect to the crude oxymethylene copolymer. 4 . A method of producing a polyoxymethylene resin composition according to claim 1 , wherein the polyoxymethylene resin composition is used for forming an extrusion molded article.
Assignees
Inventors
Classifications
- C08J3/203Primary
Solid polymers with solid and/or liquid additives · CPC title
- C08L59/04Primary
Copolyoxymethylenes · CPC title
- C08K5/098Primary
Metal salts of carboxylic acids · CPC title
Phenols; Phenolates · CPC title
with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters · CPC title
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- What does patent US2016237221A1 cover?
- A polyoxymethylene resin composition from which formaldehyde is generated in a reduced amount upon molding, without carrying out a stabilization treatment for stabilizing an unstable terminal group in a crude oxymethylene copolymer. A hindered phenol-type antioxidant agent and an ethylene-(methacrylic acid) copolymer resin or an ethylene-(acrylic acid) copolymer resin or a salt thereof are melt…
- Who is the assignee on this patent?
- Polyplastics Co
- What technology area does this patent fall under?
- Primary CPC classification C08J3/203. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Aug 18 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).