1. A backsize composition comprising
pre-crosslinked film forming polymer derived from materials comprising
monofunctional monomer and
multifunctional pre-crosslinking monomer containing at least two reactive groups,
thickener to stabilize the backsize composition, and
release agent.
2. The composition of claim 1 wherein the composition is an aqueous backsize composition that is stable for more than a week when stored at 25C.
3. The composition of claim 2 comprising from 0.1 to 3 weight percent thickener based on the total weight of solids.
4. The composition of claim 2 wherein the thickener is selected from the group consisting of a cellulosic thickener, a polyacrylate thickener, and mixtures thereof.
5. The composition of claim 2 wherein the thickener is selected from the group consisting of hydroxyethylcellulose and sodium polyacrylate.
6. The composition of claim 1 wherein the dried composition exhibits less than a 250 percent weight gain in toluene after 24 hours.
7. The composition of claim 1 wherein the film forming polymer comprises monomeric units derived from 0.5 to 5 weight percent multifunctional monomer based on total weight of monomer.
8. The composition of claim 1 wherein
monofunctional monomer is selected from the group consisting of vinyl acetate, butyl acrylate, and a combination thereof, and
thickener is selected from the group consisting of a cellulosic thickener, a polyacrylate thickener, and mixtures thereof.
9. The composition of claim 1 comprising release agent comprising a polysiloxane block copolymer.
10. The composition of claim 1 wherein the composition is an aqueous backsize composition comprising
50 to 94.5 weight percent film forming polymer comprising monomeric units derived from monomers comprising vinyl acetate and butyl acrylate,
5 to 60 weight percent release agent, and
0.1 to 3 weight percent thickener selected from the group consisting of a cellulosic thickener, a polyacrylate thickener, and mixtures thereof, based on the weight of total solids.
11. An aqueous backsize composition comprising
pre-crosslinked film forming polymer derived from materials comprising
monofunctional monomer and
multifunctional pre-crosslinking monomer containing at least two reactive groups,
thickener selected from the group consisting of a polyacrylate thickener, a cellulosic thickener, and mixtures thereof, and
release agent.
12. The composition of claim 11 comprising thickener selected from the group consisting of hydroxyethylcellulose and sodium polyacrylate.
13. A method of preparing film forming polymer, the method comprising
providing monomer comprising monofunctional monomer and multifunctional pre-crosslinking monomer containing at least two reactive groups,
subjecting a portion of the monomer to polymerization,
adding thickener after polymerization of a portion of monomer, and
polymerizing a further portion of monomer following addition of the thickener.
14. The method of claim 13 wherein the thickener is selected from the group consisting of a cellulosic, a polyacrylate, and mixtures thereof.
15. The method of claim 13 wherein thickener is added at a time between about \u2153 to about \u2154 of the total time of polymerization.
16. The method of claim 15 wherein the polymerization reaction occurs with addition of monomer over a period in the range from about 150 minutes and about 250 minutes, and thickener is added at a time after about to 90 minutes of that period.
17. The method of claim 15 wherein the polymerized film forming polymer is stable for more than a week when stored at 25C.
18. The method of claim 15 further comprising combining the film forming polymer with release agent to form a low adhesion backsize composition.
19. The method of claim 18 wherein the low adhesion backsize composition is stable for more than a week when stored at 25C.
20. A method of forming a release coating, the method comprising
providing a backsize composition comprising
pre-crosslinked film forming polymer comprising monomeric units derived from monomer comprising
monofunctional monomer and
multifunctional pre-crosslinking monomer containing at least two reactive groups,
thickener that improves the stability of the backsize composition, and
release agent,
coating the backsize composition onto a substrate to form a backsize film, and
drying the film to form a dried release coating.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A vibration unit, comprising:
a first vibration member configured to be extended from a body member and vibrated on a first plane based on a first driving signal; and
a second vibration member configured to be extended from the body member, disposed to be non-parallel with respect to the first vibration member, and vibrated on the first plane based on a second driving signal.
2. The vibration unit of claim 1, wherein the first vibration member and the second vibration member are disposed to form an acute angle or a right angle, based on the body member.
3. The vibration unit of claim 1, wherein the first vibration member and the second vibration member are disposed to form an obtuse angle or a right angle, based on the body member.
4. The vibration unit of claim 1, wherein the first vibration member and the second vibration member are configured to be vibrated in directions opposing each other, based on the first driving signal and the second driving signal.
5. The vibration unit of claim 1, wherein the vibration members include:
a first piezoelectric element configured to exert driving force by the driving signal; and
a second piezoelectric element configured to convert external vibrations into an electrical signal.
6. The vibration unit of claim 1, further comprising a third vibration member configured to be extended from the body member, disposed to be non-parallel with respect to the first vibration member and the second vibration member, and vibrated on the first plane based on a third driving signal.
7. An angular velocity sensor module, comprising:
a substrate member; and
a vibration unit configured to be formed on the substrate member, vibrated based on a driving signal, and converting external vibrations into an electrical signal,
wherein the vibration unit includes:
a body member fixed to the substrate member;
a first vibration member extended from the body member; and
a second vibration member extended from the body member and disposed to be non-parallel with respect to the first vibration member.
8. The angular velocity sensor module of claim 7, further comprising a pedestal member disposed between the substrate member and the vibration unit to maintain the vibration unit to be spaced apart from the substrate member by a first height.
9. The angular velocity sensor module of claim 7, wherein the first vibration member and the second vibration member are disposed to form an acute angle based on the body member.
10. The angular velocity sensor module of claim 7, wherein the first vibration member and the second vibration member are disposed to form an obtuse angle based on the body member.
11. The angular velocity sensor module of claim 7, further comprising a control unit configured to transmit a driving signal to the vibration unit and convert the electrical signal of the vibration unit.
12. The angular velocity sensor module of claim 11, wherein the control unit is disposed between the first vibration member and the second vibration member.
13. The angular velocity sensor module of claim 7, wherein the first vibration member and the second vibration member are configured to be vibrated in directions opposing each other based on the driving signal.
14. The angular velocity sensor module of claim 7, wherein the vibration unit further includes a third vibration member configured to be extended from the body member, disposed to be non-parallel with respect to the first vibration member and the second vibration member, and vibrated based on the driving signal.
15. The angular velocity sensor module of claim 14, wherein the third vibration member is configured to be vibrated in a direction the same as a direction in which the first vibration member is vibrated based on the driving signal.