[특허]Blowing agents formed from nanoparticles of carbonates

Blowing agents formed from nanoparticles of carbonates 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08J-009/08
출원번호	US-0662510 (2010-04-21)
등록번호	US-8563621 (2013-10-22)
발명자 / 주소	Lapierre, Renee M.
출원인 / 주소	Polyfil Corporation
대리인 / 주소	Archer & Greiner, P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 30

초록 ▼

The present invention relates to the preparation and use of a blowing agent in the form of of nanoparticles of an inorganic carbonate, and an acid. The acid is capable of being liquefied by heating to be reactive with the carbonate to release carbon dioxide that is useful as a blowing agent in all types of organic foams. The blowing agent, optionally pelletized in a suitable polymer carrier, is useful as a heat-activated blowing agent additive in polymer compositions.

대표청구항 ▼

1. A foaming agent for foaming a polymer comprising a mixture of nanoparticles of an alkaline earth metal carbonate with an average diameter of less than or equal to 0.7 microns, and an acid salt derived from weak acids and wherein the acid salts are selected from the group consisting of alkaline metal acid salts, said acid salt when liquefied being capable of reacting with said alkaline earth metal carbonate resulting in the release of carbon dioxide and forming a foamed polymer. 2. The foaming agent in claim 1 wherein said polymer is a polyolefin. 3. The foaming agent in claim 1 wherein the nanoparticles of the alkaline earth metal carbonate have an average diameter of less than 0.1 microns. 4. The foaming agent in claim 1 wherein the nanoparticles of the alkaline earth metal carbonate have an average diameter of less than 0.08 microns. 5. A method of preparing a foamed polymer utilizing a foaming agent for foaming a polymer and resulting in a foamed polymer of small pore size comprising the steps of: a) mixing a pellet comprising an alkaline earth metal carbonate, in the form of nanoparticles having an average diameter of less than or equal to 0.7 microns and an acid salt in a carrier with an unfoamed polymer to form a prefoamed mixture, and wherein the acid salt comprises an alkaline metal acid salt;b) maintaining the temperature of the prefoamed mixture above both the melting temperature of the foamed polymer and the melting temperature of the carrier and the acid salt thereby reacting the acid salt with the alkaline earth metal carbonate resulting in the release of carbon dioxide;c) maintaining the mixture at suitable foaming conditions to form a viscous foamed polymer;d) cooling the foamed polymer into a solid ande) recovering a solid foamed polymer. 6. The method as defined in claim 5 wherein the alkaline earth metal carbonate is CaCO3. 7. The method as defined in claim 5 wherein the carrier is polyethylene. 8. A method of preparing a solid foamed polymer utilizing a foaming agent comprising the steps of: a) mixing nanoparticles of an alkaline earth metal carbonate having an average diameter of less than or equal to 0.7 microns and an acid salt capable of reacting with said alkali earth metal carbonate to release carbon dioxide into an unfoamed polymer to form a mixture, said acid salt comprising an alkaline metal salt,b) maintaining the mixture at suitable foaming conditions wherein the alkaline earth metal carbonate and the acid or salt thereof react resulting in the release of carbon dioxide to form a viscous foamed polymer,c) cooling the foamed polymer into a solid andd) recovering a solid foamed polymer. 9. The method as defined in claim 8 wherein the alkaline earth metal carbonate is CaCO3. 10. The method as defined in claim 5 wherein the solid foamed polymer has pore sizes ranging from 30 to 150 microns. 11. The foaming agent of claim 1 wherein the alkaline earth metal carbonate consists of CaCO3. 12. The foaming agent of claim 1 wherein the acid salt consists of sodium citrate. 13. The foaming agent of claim 1 wherein the acid salt consists of monosodium citrate. 14. The foaming agent of claim 1 wherein the foamed polymer possesses pore sizes ranging from 30 to 150 microns. 15. The foaming agent of claim 1 wherein the foamed polymer possesses a pore size ranging between 50 to 90 microns. 16. The foaming agent of claim 1 wherein the alkaline earth metal carbonate is selected from the group comprising calcium carbonate, magnesium carbonate, barium carbonate and mixtures thereof. 17. The foaming agent of claim 1 wherein the alkaline earth metal carbonate has an average diameter equal to or less than 0.5 microns. 18. The method as defined in claim 5 wherein the acid salt is selected from the group consisting of sodium citrate and monosodium citrate. 19. The method of claim 5 wherein the alkaline earth metal carbonate is selected from the group comprising calcium carbonate, magnesium carbonate, barium carbonate and mixtures thereof. 20. The method as defined in claim 5 wherein the alkaline earth metal carbonate has an average diameter equal to or less than 0.1 microns. 21. The method of claim 5 wherein the foamed polymer has pore sizes ranging between 50 to 90 microns. 22. The method as defined in claim 8 wherein the acid salt is selected from the group consisting of sodium citrate and monosodium citrate. 23. The method as defined in claim 8 wherein the foamed polymer has a pore size ranging from 50 to 90 microns. 24. The method as defined in claim 9 wherein the nanoparticles of calcium carbonate have an average diameter of less than or equal to 0.5 microns. 25. The method as defined in claim 9 wherein the nanoparticles of calcium carbonate have an average diameter of 0.1 micron. 26. The foaming agent of claim 11 wherein the acid salt is monosodium citrate. 27. The foaming agent of claim 13 wherein the foamed polymer has a pore sizes ranging between 30 to 150 microns. 28. The foaming agent of claim 13 wherein the foamed polymer has a pore sizes ranging between 50 to-90 microns. 29. The foaming agent of claim 13 characterized by void spaces of up to 90%. 30. The foaming agent of claim 15 wherein the foamed polymer has void spaces of up to 90%. 31. The foaming agent of claim 1 wherein the polymer is polystyrene. 32. The foaming agent of claim 5 wherein the polymer is polystyrene. 33. The foaming agent of claim 8 wherein the polymer is polystyrene.

이 특허에 인용된 특허 (30)

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Needham Donald G. (Rte. 1 ; Box 300 Ramona OK 74061), Foamable polyethylene-based composition for rotational molding.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Blowing agents formed from nanoparticles of carbonates 원문보기

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Blowing agents formed from nanoparticles of carbonates 원문보기

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