US 11,951,661 B2
Process and article produced by injection molding
Friedrich Rudolf Kralits, Schomberg (CA); Sandor Palvoelgyi, E.U. (AT); David Mark Pascoe, Aurora (CA); Susan M. Kozora, Milford, MI (US); and Benedetto Reginella, Bradford (CA)
Assigned to International Automotive Components Group NA, Inc., Southfiled, MI (US)
Filed by International Automotive Components Group NA, Inc., Southfield, MI (US)
Filed on Dec. 2, 2021, as Appl. No. 17/540,582.
Claims priority of provisional application 63/120,465, filed on Dec. 2, 2020.
Prior Publication US 2022/0168928 A1, Jun. 2, 2022
Int. Cl. B29C 44/00 (2006.01); B29C 44/08 (2006.01); B29C 44/42 (2006.01); B29C 44/58 (2006.01); B29K 105/06 (2006.01)
CPC B29C 44/083 (2013.01) [B29C 44/428 (2013.01); B29C 44/585 (2013.01); B29K 2105/06 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of forming an injection molded part comprising:
providing an injection mold comprising a first mold half and a second mold half that provides a molding cavity between the first mold half and the second mold half, wherein the molding cavity includes one or more locations having an initial spacing;
injecting a polymer composition into the molding cavity, the polymer composition comprising: (a) a first polymer having a melt strength of greater than or equal to 20.0 cn and a melt extensibility of greater than or equal to 100 mm/sec; (b) a second thermoplastic polymer having a melt flow index of greater than or equal to 10.0 g/10.0 minutes; (c) reinforcing fiber; (d) a foaming agent;
increasing said molding cavity initial spacing at said one or more locations; and
forming the injection molded part in the molding cavity from the polymer composition wherein the injection molded part includes a cellular structure.