Polysiloxane Films and Methods of Making Polysiloxane Films
AssigneeMotorola Mobility LLC
InventorsRichard W. Brotzman, Ernest Sirois, Deborah Paskiewicz
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Abstract
A polysiloxane film comprises Si—O bonds and has a thickness of 0.3 to 1.5 microns. Adjacent electrodes coated with the polysiloxane film have a leakage current of at most 0.01 mA at 10 V after contact with water. An electrode coated with the polysiloxane film has a contact resistance of at least 0.01 ohms at 1.0 mm of pogo pin compression under a 1.0 N load. The polysiloxane film provides IPx7 protection from ingress of water.
Claims20
A polysiloxane film comprising Si—O bonds and having a thickness of 0.3 to 1.5 microns,
- wherein the polysiloxane film passes the corrosion current test, and
- the polysiloxane film passes the contact resistance test.
A method of forming a polysiloxane film, comprising:
- polymerizing monomers comprising at least one siloxane monomer having the formula (X1)nSi(R1)4-n, wherein n is 1, 2 or 3;
- (X1)Si(R1)2OSi(R1)2(X1);
- (X1)(Si(R1)2O)2Si(R1)2(X1);
- and [OSi(R1)2]m, wherein m is 3 or 4;
- wherein X1 is Cl or OR2,
- R2 is alkyl,
- each R1 is independently selected from the group consisting of amino, hydroxyl, mercapto, alkoxy, alkyl, cycloalkyl, aryl and heteroaryl,
- the polysiloxane film contains Si—O bonds,
- the polysiloxane film has a thickness of 0.3 to 1.5 microns,
- the polysiloxane film passes the corrosion current test, and
- the polysiloxane film passes the contact resistance test.
A method of forming a polysiloxane film in a reaction chamber, comprising:
- polymerizing monomers comprising at least one siloxane monomer having the formula (X1)nSi(R1)4-n, wherein n is 1, 2 or 3;
- (X1)Si(R1)2OSi(R1)2(X1);
- (X1)(Si(R1)2O)2Si(R1)2(X1);
- and [OSi(R1)2]m, wherein m is 3 or 4;
- wherein the polymerization is catalyzed by a 30-60 W radio frequency plasma,
- the pressure in the reaction chamber during the polymerization is 100-400 mTorr,
- X1 is Cl or OR2,
- R2 is alkyl,
- each R1 is independently selected from the group consisting of amino, hydroxyl, mercapto, alkoxy, alkyl, cycloalkyl, aryl and heteroaryl,
- the polysiloxane film contains Si—O bonds,
- the polysiloxane film has a thickness of 0.3 to 1.5 microns.
Dependencies are inferred from the claim text.