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Process for foaming polyolefin compositions using an azodicarbonamide/citrate mixture as a nucleating agent
US2020148868A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020148868-A1 |
| Application number | US-202016742357-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jan 14, 2020 |
| Priority date | May 8, 2015 |
| Publication date | May 14, 2020 |
| Grant date | — |
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Abstract
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A process of foaming a polyolefin, e.g., polyethylene, composition using as a nucleator a combination of (A) azodicarbonamide, and (B) a mixture of (1) a first component consisting of at least one of citric acid and an alkali metal citrate, and (2) a second component consisting of at least one of an alkali metal citrate, a di-alkali metal hydrogen citrate, an alkali metal dihydrogen citrate and an alkali metal bicarbonate, with the proviso that the mixture is not solely composed of alkali metal citrate.
First claim
Opening claim text (preview).
1 . A foamable polyolefin composition comprising: (A) high-density polyethylene (“HDPE”); (B) low-density polyethylene (“LDPE”); (C) azodicarbonamide (“ADCA”); and (D) a mixture selected from the group consisting of (a) a combination of sodium bicarbonate, sodium citrate, and disodium hydrogen citrate, (b) a combination of citric acid and sodium dihydrogen citrate and (c) mixtures thereof 2 . The foamable polyolefin composition of claim 1 , wherein the mixture is from 0.06 to 0.12 weight percent of the foamable polyolefin composition. 3 . The foamable polyolefin composition of claim 1 , wherein the sodium bicarbonate constitutes in the range of from 50 to 80 weight percent of the mixture with the sodium citrate and the disodium hydrogen citrate constituting the remainder. 4 . The foamable polyolefin composition of claim 3 , wherein the citric acid and said sodium dihydrogen citrate are present in a weight ratio of about 60:40. 5 . The foamable polyolefin composition of claim 1 , wherein the ADCA is from 0.03 to 0.09 weight percent of the foamable polyolefin composition. 6 . The foamable polyolefin composition of claim 1 , wherein the HDPE is from 45 to 95 weight percent of the foamable polyolefin composition. 7 . The foamable polyolefin composition of claim 1 , wherein the LDPE is from 4 to 54 weight percent of the foamable polyolefin composition. 8 . The foamable polyolefin composition of claim 1 , wherein the ADCA and the mixture are present in an ADCA-to-mixture weight ratio ranging from less than 80:20 to greater than 15:85. 9 . The foamable polyolefin composition of claim 1 , wherein the foamable polyolefin composition further comprises an additive selected from the group consisting of antioxidants, cell stabilizers, and combinations thereof.
Assignees
Inventors
Classifications
Alkali metal carbonates · CPC title
characterized by the use of several polymeric components · CPC title
Azodicarbonamide · CPC title
Azo-compounds · CPC title
Polyethene · CPC title
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- What does patent US2020148868A1 cover?
- A process of foaming a polyolefin, e.g., polyethylene, composition using as a nucleator a combination of (A) azodicarbonamide, and (B) a mixture of (1) a first component consisting of at least one of citric acid and an alkali metal citrate, and (2) a second component consisting of at least one of an alkali metal citrate, a di-alkali metal hydrogen citrate, an alkali metal dihydrogen citrate and…
- Who is the assignee on this patent?
- Dow Global Technologies Llc
- What technology area does this patent fall under?
- Primary CPC classification C08L23/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu May 14 2020 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).