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| Composite closure |
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| Polypropylene closure with removable liner |
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| Plastic closure with compression molded sealing liner |
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| High melt strength, propylene polymer, process for making it, and use thereof |
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Sealant compositions and sealed electrical connectors
| Details |
Inventors: Koblitz, Francis F.; Lynch, Thomas J.; Mellinger, Ricky C.;
Assignee: The Whitaker Corporation (Wilmington, DE)
Primary Examiner: Michl; Paul R.
Assistant Examiner: Merriam; Andrew E. C.
Attorney, Agent or Firm:
Disclosed are sealant compositions having excellent slump and spew resistance, even at relatively high operating temperatures for electrical connectors. The sealants, which are flowable at such elevated temperatures, comprise two essential components: elastomeric thermoplastic polymer, preferably an organic polymer composite comprising diblock and triblock copolymers, and extender for the polymer. The extender may comprise a primary and a secondary extender, such as polybutene oil and mineral oil, respectively. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS THE COMPOSITIONS The present invention provides sealant compositions requiring two essential components: elastomeric thermoplastic polymer, preferably an organic polymer composite comprising diblock and triblock copolymers, and extender for the polymer.
An important aspect of the present invention is the requirement of certain embodiments that the extender comprise a primary and secondary extender.
Applicants have found that the secondary extender preferably comprises, and more preferably consists of, a high solvency latent extender.
As the term is used herein, "high solvency latent extender" refers to an extender which has substantially no capacity to form a functional solution or gel of the elastomeric thermoplastic polymer at temperatures below about 40.
degree.
C.
while exhibiting a substantial swelling and dissolving capacity at temperatures above about 80.
degree.
C.
It is preferred that the primary extender of the present invention comprise, and preferably consist of, a low solvency latent extender.
As the term is used herein, a "low solvency latent extender" refers to an extender which has no substantial capacity to form a functional solution or gel of the elastomeric thermoplastic polymer of the present invention below about 80.
degree.
C.
and has substantial dissolving capability only at temperatures above about 125.
degree.
C.
It should be understood that this dissolving capability resides in the ability to solvate the polymer molecules and is also manifested in the relative plasticizing capability of the extenders.
Another important aspect of the present invention is the requirement of certain embodiments that the elastomeric, thermoplastic polymer comprise a composite of primary polymer and secondary polymer.
The term "polymer molecular composite" is used herein to designate polymer compositions comprising two or more polymeric compounds, preferably two or more polymeric compounds mixed together in intertwined domains or in interspersed domains
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