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Soap-thickened reenterable gelled encapsulants
| Details |
Inventors: Billigmeier, James E.; Groves, James D.; Haugen, Hartwick A.; Pokorny, Richard J.;
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Examiner: Lieberman; Paul
Assistant Examiner: Kirschner; Helene
Attorney, Agent or Firm: Sell; Donald M., Smith; James A., Sherman; Lorraine R.
A gelled dielectric encapsulant material and process therefor for use in reenterable and nonreenterable communication cable splices as well as applications relating to encapsulation of electronic components comprises a plasticizer which does not stress crack polycarbonate, an aliphatic or aromatic carboxylic acid, and a basic oxide or hydroxide. |
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DETAILED DESCRIPTION Two preferred embodiments, designated Encapsulant Compositions A and B, will be described.
Encapsulant Composition A comprises: (a) a plasticizer which can be a naphthalenic or paraffinic oil having an aromatic (single ring, fused ring, or polyaromatic hydrocarbon) content of less than 15 weight percent and a paraffinic (saturated or unsaturated straight-chain or cyclic hydrocarbon) content of 85 to 100 weight percent, the oil having a specific gravity in the range of 0.
80 to 1.
00, preferably 0.
82 to 0.
94, (b) an aliphatic or aromatic carboxylic acid having 18 to 1000 carbon atoms, preferably having 18 to 200 carbon atoms, (c) a basic oxide selected from CaO or ZnO, (d) optionally, an elastomer which is soluble in the composition, and (e) optionally, a hydrophilic additive.
This embodiment is based on the surprising feature that certain carboxylic acids may be combined with certain inorganic basic oxides (i.
e.
, CaO and ZnO) in oils to form a paste in which no reaction between the acid and the base will take place and which is stable at ambient conditions.
However, upon the addition of water the acid and base react to form a hard solid.
The presence of water generates a "soap" in situ which surprisingly serves to thicken oils at moderate temperatures (e.
g.
, 0.
degree.
to 60.
degree.
C.
).
This is a particularly desirable property in a reenterable encapsulant composition used with buried communication cable where the ingress of water can cause a reaction to take place in the composition which provides a solid protective material for the cable.
It is further surprising that certain thermoplastic elastomers in "crumb" form can swell and dissolve in oil, without any mixing of the elastomer and the oil, and thicken the oil by forming a homogeneous gel even at ambient temperatures.
Use of such an elastomer is particularly desirable in applications involving on-site repairs where the encapsulant composition is to be applied directly to the closure without prior mixing.
The plasticizer, carboxylic acid, and basic oxide form a composition having the consistency of grease
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Adhesives and Rubbers 
