Pre-expanded polypropylene resin particles, in-mold foam molded product of polypropylene resin, and method for manufacturing same
US-9505857-B2 · Nov 29, 2016 · US
Method and a device for preparation of expanded thermoplastic microspheres
US9718939B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9718939-B2 |
| Application number | US-201314425460-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 4, 2013 |
| Priority date | Sep 7, 2012 |
| Publication date | Aug 1, 2017 |
| Grant date | Aug 1, 2017 |
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- Title
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Abstract
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The invention relates to a method of preparing expanded thermoplastic microspheres from thermally expandable thermoplastic microspheres comprising a polymer shell encapsulating a foaming agent, the method comprising heating the expandable microspheres within a flexible container ( 2 ) to effect expansion of said microspheres and withdrawing gas from said flexible container ( 2 ). The invention further relates to an expansion device for preparing such expanded thermoplastic microspheres.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of preparing expanded thermoplastic microspheres from thermally expandable thermoplastic microspheres comprising a polymer shell encapsulating a foaming agent, the method comprising heating the expandable microspheres within a flexible container made of a material impermeable to gas to effect expansion of said microspheres, and withdrawing gas from said flexible container, and agitating said thermally expandable microspheres during the expansion, wherein the flexible container is a bag. 2. The method of claim 1 wherein the withdrawing of gas from said flexible container is through a conduit provided with a filter. 3. The method of claim 1 wherein the agitating is performed by rotating the flexible container during the expansion of the microspheres. 4. The method of claim 1 wherein the thermally expandable microspheres are pre-mixed with a dispersing agent to prevent agglomeration of said microspheres. 5. The method of claim 4 wherein said dispersing agent is silicon dioxide or titanium dioxide. 6. The method of claim 2 further comprising blowing gas through said filter to free it from microspheres after expansion is completed. 7. A method of preparing expanded thermoplastic microspheres from thermally expandable thermoplastic microspheres comprising a polymer shell encapsulating a foaming agent, the method comprising heating the expandable microspheres within a flexible container made of a material impermeable to gas to effect expansion of said microspheres, and withdrawing gas from said flexible container, and agitating said thermally expandable microspheres during the expansion, wherein the flexible container is a sack. 8. The method of claim 7 wherein the withdrawing of gas from said flexible container is through a conduit provided with a filter. 9. The method of claim 7 wherein the agitating is performed by rotating the flexible container during the expansion of the microspheres. 10. The method of claim 7 wherein the thermally expandable microspheres are pre-mixed with a dispersing agent to prevent agglomeration of said microspheres. 11. The method of claim 10 wherein said dispersing agent is silicon dioxide or titanium dioxide. 12. The method of claim 8 further comprising blowing gas through said filter to free it from microspheres after expansion is completed.
Assignees
Inventors
Classifications
- B29C44/3461Primary
Making or treating expandable particles · CPC title
Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material · CPC title
Heating or cooling · CPC title
Characterised by the use of unspecified polymers · CPC title
Use of inorganic compounding ingredients · CPC title
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- What does patent US9718939B2 cover?
- The invention relates to a method of preparing expanded thermoplastic microspheres from thermally expandable thermoplastic microspheres comprising a polymer shell encapsulating a foaming agent, the method comprising heating the expandable microspheres within a flexible container ( 2 ) to effect expansion of said microspheres and withdrawing gas from said flexible container ( 2 ). The invention …
- Who is the assignee on this patent?
- Akzo Nobel Chemicals Int Bv
- What technology area does this patent fall under?
- Primary CPC classification B29C44/3461. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 01 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). 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).