US 10,889,047 B2
Multilayer plastic bottles with mineral filler and foamed layer for improved recyclability
William D. McIntyre, Pleasanton, CA (US); and Lisa H. Olson, Pleasanton, CA (US)
Assigned to The Clorox Company, Oakland, CA (US)
Filed by THE CLOROX COMPANY, Oakland, CA (US)
Filed on Apr. 30, 2015, as Appl. No. 14/700,545.
Application 14/700,545 is a continuation of application No. 14/639,869, filed on Mar. 5, 2015.
Prior Publication US 2016/0257053 A1, Sep. 8, 2016
Int. Cl. B29C 49/22 (2006.01); B29C 49/04 (2006.01); B29C 49/00 (2006.01); B65D 1/02 (2006.01); B29L 31/00 (2006.01)
CPC B29C 49/22 (2013.01) [B29C 49/0005 (2013.01); B29C 49/04 (2013.01); B65D 1/0215 (2013.01); B29K 2023/04 (2013.01); B29K 2909/00 (2013.01); B29L 2031/712 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method of forming a blow-molded plastic article, including multiple layers, the method comprising:
(a) providing a polymeric material as a multilayer parison, the polymeric material comprising a polyolefin;
(b) conveying the polymeric material in a downstream direction in an extruder;
(c) introducing a mineral filler material comprising: calcium carbonate into the extruder to be mixed with at least a first layer of the multilayer parison of the polymeric material; and
(d) introducing a foaming agent into the extruder to at least a second layer of the multilayer parison to form a mixture of foaming agent and the polymeric material in the second layer; and
(e) subjecting the mixture of foaming agent and polymeric material to blow-molding conditions to form a cellular foamed blow-molded article; and
(f) wherein the cellular blow-molded article comprises:
(i) the first layer that is not cellular foamed comprising: polymeric material and about 8% to 35% by weight of the mineral filler; and
(ii) the second layer different from the first layer, comprising: polymeric material and the foaming agent.