US4355062A
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US
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Bis(hydroxyalkyl)disiloxanes and lubricant compositions thereof
Assignee: RCA Corp
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Filing: 1981-02-05
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Granted: 1982-10-19
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Expires: 2001-02-05
Abstract
Abstract Bis(hydroxyalkyl)disiloxane lubricants of the formula <IMAGE> wherein R1 and R3 are methyl or ethyl and R2 and R4 are linear alkyl groups of up to 20 carbon atoms. These compounds are useful as additives to methyl alkyl siloxane lubricants for conductive high density information discs. Discs lubricated with the lubricant mixture exhibit improved stability to environments of high temperature and high relative humidity.
Inventors
- 👤 Chih C. Wang
- 👤 Ronald F. Bates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:12
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/682; C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/12; C07F7/14; C07F7/18; C07F7/1804; C10; C10M; C10M107/00; C10M107/50; C10M111/00; C10M111/04; C10M139/00; C10M139/04; C10M169/00; C10M169/04; C10M2227/00; C10M2227/02; C10M2227/025; C10M2227/04; C10M2227/045; C10M2229/00; C10M2229/02; C10M2229/025; C10M2229/04; C10M2229/0405; C10M2229/041; C10M2229/0415; C10M2229/042; C10M2229/0425; C10M2229/043; C10M2229/0435; C10M2229/044; C10M2229/0445; C10M2229/045; C10M2229/0455; C10M2229/046; C10M2229/0465; C10M2229/047; C10M2229/0475; C10M2229/048; C10M2229/0485; C10M2229/05; C10M2229/0505; C10M2229/051; C10M2229/0515; C10M2229/052; C10M2229/0525; C10M2229/053; C10M2229/0535; C10M2229/054; C10M2229/0545; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31533; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
In a high density information record adapted for use with a playback stylus to effect recovery of signals occupying a bandwidth of at least several megahertz when relative motion at a desired rate is established between said record and said stylus, said record comprising a disc of a conductive material containing an information track constituted by a surface relief pattern in said track to accommodate recovery of signals of said bandwidth upon establishment of relative motion at said rate, said record being coated with a methyl alkyl siloxane lubricant having the formula ##STR8## wherein R 5 and R 6 are alkyl groups of 4-20 carbon atoms, x is an integer of 2-4, y is an integer of 0-2 and wherein the sum of x and y is 4 or less, the improvement which comprises adding to said lubricant a bis(hydroxyalkyl)disiloxane having the formula ##STR9## wherein R 1 and R 3 are methyl or ethyl and R 2 and R 4 are linear alkyl groups of up to 20 carbon atoms.
Claim 2
Dependent Claim
170 words
In a high density information record adapted for use with a playback stylus to effect recovery of signals occupying a bandwidth of at least several megahertz when relative motion at a desired rate is established between said record and said stylus, said record comprising a disc of a conductive material containing an information track constituted by a surface relief pattern in said track to accommodate recovery of signals of said bandwidth upon establishment of relative motion at said rate, said record being coated with a methyl alkyl siloxane lubricant having the formula ##STR8## wherein R 5 and R 6 are alkyl groups of 4-20 carbon atoms, x is an integer of 2-4, y is an integer of 0-2 and wherein the sum of x and y is 4 or less, the improvement which comprises adding to said lubricant a bis(hydroxyalkyl)disiloxane having the formula ##STR9## wherein R 1 and R 3 are methyl or ethyl and R 2 and R 4 are linear alkyl groups of up to 20 carbon atoms.
Claim 3
Dependent Claim
14 words
A record according to claim 1 wherein R 1 and R 3 are methyl.
Claim 4
Dependent Claim
18 words
A record according to claim 1 wherein R 2 and R 4 are C 8 -C 12 .
Claim 5
Dependent Claim
25 words
A record according to claim 1 wherein R 2 and R 4 are C 10 H 21 and R 1 and R 3 are methyl.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |