Foamed propylene-based elastomer compositions, methods for making and products made therefrom
OwnerJie Yu JIN, Yan WANG +8inventors
InventorsJie Yu JIN, Yan WANG, Haibin QIU, Yujie SHENG, Liang LI, Hai Yin HUA, Hongchao WANG, Yaxian WANG, Tao TANG, Minggang LI
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Abstract
Foamed polymer compositions and products made therefrom are disclosed, More particularly, foamed polymer compositions including propylene-based elastomers, The compositions including such propylene-based elastomers require less energy to mold, without sacrifice performance of the foamed product.
Claims18
A foamable polymer composition comprising:
- (a) at least 5 wt %, based on the total weight of the composition, of at least one propylene-based elastomer comprising propylene and about 15 wt % to about 30 wt % of one or more alpha-olefin derived units, based on a total weight of the elastomer, wherein the propylene-based elastomer has a MFR of at least 3 g/10 min and a heat of fusion (Hf) of about 3 J/g to about 75 J/g, as determined by DSC;
- (b) less than 95 wt %, based on the total weight of the composition, of at least one polypropylene;
- and
- (c) a foaming agent;
- wherein, prior to combination with the foaming agent, the polymer blend has a density of at least 0.80 g/cm3 and after the blend is foamed, the foamed article has a density of 0.2 g/cm3 or less.
A foamed bead comprising at least 80 wt %, based on the total weight of the foamed bead, of a propylene-based elastomer comprising propylene and about 15 wt % to about 30 wt % of one or more alpha-olefin derived units, based on a total weight of the elastomer, wherein the propylene-based elastomer has a MFR of at least 3 g/10 min and a heat of fusion (Hf) of about 3 J/g to about 75 J/g, as determined by DSC.
A process for producing a foamed bead article, comprising:
- introducing a plurality of foamed beads to a mold;
- increasing the pressure within the mold to an elevated pressure from 0.1-0.5 MPa;
- heating the foamed beads within the mold to an elevated temperature from 35-125° C.;
- maintaining the elevated pressure and elevated temperature for a compression time to form the foamed bead article;
- and
- releasing the article.
Dependencies are inferred from the claim text.