Patent US3758642A successfully refreshed from Google Patents.
US3758642A
Expired / Lapsed
US
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Production of dental prosthesis
Assignee: Bayer AG
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Filing: 1971-11-15
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Granted: 1973-09-11
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Expires: 1991-11-15
Abstract
Abstract An improved composition for use in the production of dental prostheses, comprising 85-60 parts of a polymer of methacrylic acid and 40-15 parts of an acrylic acid ester/methyl methacrylate or methacrylic acid ester/methyl methacrylate copolymer, where the ester content in the copolymer, the molecular weight of the polymer and copolymer, and the particle size of the polymer and copolymer are required to be within specified ranges to obtain a rapid start of processing and a processing time of at least one hour when the composition is used.
Inventors
- 👤 H Logemann
- 👤 P Bruckmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:33
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
54 words
a mixture of said finely divided polymer of methacrylic acid methyl ester and a polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a particle size one-fifth to one-half as large as said finely divided polymer of methacrylic acid methyl ester; or
Claim 2
Dependent Claim
86 words
a copolymer of 18-30 percent of one or more methacrylic acid esters containing seven to 14 carbon atoms in the alcohol residue, the balance comprising methacrylic acid methyl ester and 0 to 5 percent of a further comonomer, and having a K-value of 76-80 when the copolymer has a sieve analysis of at least 10 percent of particles above 80 Mu , and a K-value of 80-90 when the copolymer has a sieve analysis of at least 25 percent of particles above 80 Mu ; or
Claim 3
Dependent Claim
57 words
The composition of claim 1, wherein component A is a finely divided polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a sieve analysis of at least 98 percent of particles below 125 Mu and more than 50 percent of particles above 63 Mu .
Claim 4
Dependent Claim
59 words
a copolymer of 20-50 percent of one or more methacrylic acid esters containing four to six carbon atoms in the alcohol residue, the balance comprising methacrylic acid methyl ester and 0 to 5 percent of a further comonomer, and having a K-value of 76-95 and a sieve analysis of at least 15 percent of particles above 80 Mu .
Claim 5
Dependent Claim
96 words
a mixture of a. a coarser polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a sieve analysis of at least 99 percent of particles below 150 Mu and more than 50 percent of particles above 63 Mu , and b. a polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a particle size one-fifth to one-half as large as said coarser polymer of methacrylic acid methyl ester; and component B being:
Claim 6
Dependent Claim
99 words
The composition of claim 1, wherein component A is a mixture of a finely divided polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a sieve analysis of at least 98% of particles below 125 Mu and more than 50 percent of particles above 63 Mu and a polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a particle size one-fifth to one-half as large as said finely divided polymer of methacrylic acid methyl ester.
Claim 7
Dependent Claim
99 words
The composition of claim 1, wherein component A is a mixture of a coarser polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a sieve analysis of at least 99 percent of particles below 150 Mu and more than 50 percent of particles above 63 Mu , and a polymer of methacrylic acid methyl ester containing 0 to 2 percent of a comonomer and having a K-value of 75-120 and a particle size one-fifth to one-half as large as said coarser polymer of methacrylic acid methyl ester.
Claim 8
Dependent Claim
58 words
The composition of claim 1, wherein component B is a copolymer of 15-30 percent of one or more acrylic acid esters, the balance being methacrylic acid methyl ester and 0 to 5 percent of a further comonomer, and having a K-value of 76-95 and a sieve analysis of at least 15 percent of particles above 100 Mu .
Claim 9
Dependent Claim
88 words
The composition of claim 1, wherein component B is a copolymer of 18-30 percent of one or more methacrylic acid esters containing seven to 14 carbon atoms in the alcohol residue, the balance comprising methacrylic acid methyl ester and 0 to 5 percent of a further comonomer, and having a K-value of 76-80 and a sieve analysis of at least 10 percent of particles above 80 Mu , or a K-value of 80-90 and a sieve analysis of at least 25 percent of particles above 80 Mu .
Claim 10
Dependent Claim
68 words
The composition of claim 1, wherein component B is a copolymer of 20-50 percent of one or more methacrylic acid esters containing four to six carbon atoms in the alcohol residue, the balance comprising methacrylic acid methyl ester and 0 to 5 percent of a further comonomer, and having a K-value of 76-95 and a sieve analysis of at least 15 percent of particles above 80 Mu .
Claim 11
Dependent Claim
21 words
The composition of claim 1, wherein there is 80 to 70 parts of component A per 20-30 parts of component B.
Claim 12
Dependent Claim
12 words
The composition of claim 1, wherein the polymers and copolymers are bead-shaped.
Claim 13
Dependent Claim
18 words
The composition of claim 2, wherein the K-value of the finely divided polymer is from 80 to 100.
Claim 14
Dependent Claim
16 words
The composition of claim 3, wherein said finely divided polymer constitutes 50-95 percent of said mixture.
Claim 15
Dependent Claim
16 words
The composition of claim 4, wherein said finely divided polymer constitutes 50-95 percent of said mixture.
Claim 16
Dependent Claim
16 words
The composition of claim 5, wherein the copolymer contains 20-25 percent of said acrylic acid esters.
Claim 17
Dependent Claim
21 words
The composition of claim 5, wherein the alcohol residues of said acrylic acid esters contain from one to eight carbon atoms.
Claim 18
Dependent Claim
17 words
The composition of claim 5, wherein said acrylic acid ester is methyl, ethyl, butyl or 2-ethylhexyl acrylate.
Claim 19
Dependent Claim
21 words
The composition of claim 5, wherein the copolymer has not more than 80 percent of the particles above 100 Mu .
Claim 20
Dependent Claim
26 words
The composition of claim 6, wherein the copolymer contains 20-25 percent of said methacrylic acid esters containing seven to 14 carbon atoms in the alcohol residue.
Claim 21
Dependent Claim
24 words
The composition of claim 6, wherein the copolymer of K-value between 76 and 80 has at least 25 percent particles above 80 Mu .
Claim 22
Dependent Claim
25 words
The composition of claim 6, wherein the methacrylic acid ester containing seven to 14 carbon atoms in the alcohol residue is methacrylic acid n-decyl ester.
Claim 23
Dependent Claim
26 words
The composition of claim 7, wherein the copolymer contains 35-40 percent of said methacrylic acid esters containing four to six carbon atoms in the alcohol residue.
Claim 24
Dependent Claim
19 words
The composition of claim 7, wherein the copolymer has at least 25 percent of particles above 80 Mu .
Claim 25
Dependent Claim
23 words
The composition of claim 7, wherein the methacrylic acid ester containing four to six carbon atoms in the alcohol residue is butyl methacrylate.
Claim 26
Dependent Claim
13 words
The composition of claim 1, wherein component A is coarser than component B.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |