Inventors:
Joseph Kuczynski - Rochester MN, US
Melissa K. Miller - Research Triangle Park NC, US
Heidi D. Williams - Cary NC, US
Jing Zhang - Poughkeepsie NY, US
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
B29C 47/92, B29C 45/00
Abstract:
a method comprising injection molding a plastic part from a polymer formulation comprising an injection moldable thermoplastic and an additive, wherein the additive has a decomposition temperature that establishes a maximum processing temperature for the polymer formulation. The additive will thermally decompose to generate gaseous products causing visible bubble formation in the surface of the plastic part in response to exposure to a processing temperature that exceeds the decomposition temperature of the additive. A suitable additive may be, for example, selected from oxalates, carbamic acids, carbonic acids, diazocarbonyl compounds, and combinations thereof.