VERFAHREN ZUR BESCHICHTUNG VON KOHLENSTOFFKOERPERN.
摘要
<p>Described is a way of sealing a carbon body such as monolithic graphite tooling so that it retains its vacuum integrity through numerous thermal cycles typical of thermoplastic processing. This is accomplished by (a) applying to the body surface a coating formulation composed of a carbon-filled solution of a polyamic acid formed by reaction between pyromellitic acid dianhydride and a 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane, and (b) heat curing the coated body to cause the polyamic acid to imidize into a thermally cured polyimide.</p>
申请公布号
DE68901643(D1)
申请公布日期
1992.07.02
申请号
DE1989601643
申请日期
1989.10.18
申请人
ETHYL CORP., BATON ROUGE, LA., US
发明人
PRESSWOOD, JOHN KENNETH, BATON ROUGE LOUISIANA 70815, US;O'QUINN, ALETHEA HOOD, BATON ROUGE LOUISIANA 70809, US