Document:

LETTER AGREEMENT, DATED MARCH 21, 205 W/ JOHN GERARD MACKAY

 EXHIBIT 10.10 
  
 LETTER AGREEMENT, DATED MARCH 21, 2005 BETWEEN
MYKROLIS 
 CORPORATION AND JOHN GERARD MACKAY

  

 152 

 March 21, 2005 
  
 Mr. Gerry Mackay 
 17 Wollerton Park 

#03-127 Gallop Green 
 Singapore 257536 
  
 Dear Gerry: 
  
 As you know, we have announced that there will be a merger of equals transaction (the “Merger”) between Mykrolis Corporation (the
“Company”) and Entegris, Inc.], with a new Delaware corporation to be called Entegris, Inc. (“new Entegris”) as the surviving corporation. This transaction has been approved by the Boards of Directors of both Mykrolis and
Entegris. While the conclusion of this Merger is still subject to stockholder and regulatory approvals, I want to act promptly to advise you of your role in the combined enterprise and the incentive compensation package that will be offered to you
upon the effectiveness of the Merger. We believe that the combination of Mykrolis and Entegris will create exciting, dynamic, growth oriented opportunities for the stockholders and employees of both companies. For this reason we have developed an
incentive compensation package for you designed to encourage you to work aggressively towards the successful integration of the two enterprises into a single world class company with performance that makes it a “must-own stock” for
investors. I hope the integration of the two businesses will be a smooth process and that you will become a major contributor to the success and growth of the combined enterprise and that in turn your experience as a member of the new Entegris team
will be personally rewarding and serve you well in the future. 
  
 The provisions
of this letter and your employment relationship with new Entegris will be subject to the contingencies set forth in paragraph 7 below. 
  
 1. Duties, Title and Salary. Your position, duties, and compensation in your
employment with new Entegris will be as follows: 
  

			
	Title:	  	Vice President Global Sales
		
	Duties:	  	Management of the Global Sales organization of new Entegris
		
	Reporting Point:	  	Executive Vice President and Chief Marketing Officer
		
	Base Salary:	  	Sing.$369,625.00 annually, paid monthly.
		
	Incentive Plan:	  	You will be entitled to participate in the new Entegris management incentive plan at a level commensurate with your position and which will give appropriate recognition to your performance
for the Company prior to the Merger . The details of this plan and appropriate transition arrangements will be developed during the integration planning process prior to the effectiveness of the Merger.
		
	Equity Incentive:	  	Upon the effectiveness of the merger, new Entegris will award you 75,000 shares of restricted stock in new Entegris. The restrictions will lapse with respect to 37.5% of this award on
December 31, 2005; an additional 5.21% on the last business day of each of the twelve fiscal quarters of new Entegris following the closing of the

  

 153 

			
	 	  	Merger. Prior to the time that restrictions lapse, the restricted stock will be non-transferable and will be subject to the risk of forfeiture if your employment with new Entegris terminates.
This award will be subject to the terms of the new Entegris standard restricted stock award agreement.
		
	Project Bonus:	  	Upon successful and timely completion of integration milestones you will also be eligible to receive a one time bonus in the amount of 30% of your annual base salary, in accordance with the
Project Completion Bonus Incentive guidelines.
		
	Planning Bonus:	  	As part of the planning committee you will be eligible to receive a one time planning bonus in the amount of 30% of your pro rated annual base salary during the period from March 1, 2005
through the closing date of the Merger.

  
 During your employment by new
Entegris, you agree to devote your entire assigned working time to your duties at new Entegris and to comply with the new Entegris ethics code and with all company policies. Upon becoming a new Entegris employee, you will be given a new employee
document package containing employee forms and agreements, which you will be required to promptly complete, sign and return. 
  
 2. At-Will Employment, etc. While it is our sincere hope and belief that our relationship will be a long one, your employment
relationship with new Entegris will be “at-will.” This means your employment is not for any specific period of time and can be terminated by you or new Entegris at any time, with or without cause or advance notice. In addition, new
Entegris will reserve the right to modify your position or duties to meet business needs. Any change to the at-will employment relationship must be by a specific, written agreement signed by you and by new Entegris’s Senior Vice President of
Human Capital. 
  
 3. Prior Employer
Service Credit. For purposes of benefit eligibility, vesting, vacation and sick pay accruals for your employment with new Entegris, you will receive service credit based on your prior service with the Company. 

  
 4. Change of Control
Agreement. Upon the effectiveness of the Merger and as a condition to the equity incentive award described above, you will be required to enter into an executive change of control agreement with new Entegris in replacement
and cancellation of your current Amended and Restated Executive Termination Agreement with the Company. This agreement will generally provide for severance benefits and accelerated vesting of stock option and restricted stock awards in the event
that your employment with new Entegris is terminated during a period of two years following a change of control (including a change of control effected by the Merger). The severance benefit will generally be equal to two years base salary plus
variable compensation at the highest level during the three years prior to any change of control termination of employment. This agreement will also contain a two year non-competition clause. 
  
 5. Benefits. As a new
Entegris employee, you will be entitled to participate in all benefits that new Entegris currently provides its U.S. employees, subject to the eligibility requirements 

  

 154 

 
set forth in new Entegris’s benefit plans and/or policies. New Entegris will reserve the right to change or eliminate the benefits it provides to all
employees on a prospective basis at any time. Due to administrative complexities arising out of the post Merger integration of benefit systems, however, there may be certain benefits in which you will not be immediately eligible to participate. To
minimize any disruption, your existing benefits will be continued during this interim integration period. Upon becoming a new Entegris employee, you will be eligible for paid holidays pursuant to new Entegris’s holiday schedule, which will be
determined at the beginning of each calendar year. 
  
 6.
401(k) Savings & Investment Plan. It is expected that new Entegris will offer a 401(k) plan with provisions substantially similar to those of the current 401(k) plan of the Company. It is also expected that you will
be eligible to roll your distribution from the Company 401(k) plan into the new Entegris 401(k) plan in accordance with its provisions if you wish to do so. Generally, we expect that new Entegris 401(k) plan will be a combined discretionary employer
retirement contribution plan with a target contribution level determined in the discretion of the new Entegris Board of Directors and a 401(k) plan, which will generally provide for an employer match for employee contributions (currently at the rate
of 50% of employee qualifying contributions up to 6% of compensation), however, specific provisions of the new Entegris plan will be finalized in the coming weeks. 
  
 7. Contingencies. This offer is contingent upon the following: 
  
 (a) Successful closing of the Merger; 
  
 (b) Your continued, active employment with the Company through the
closing of the Merger; 
  
 (c) Signing a standard new
Entegris Employee Agreement; and 
  
 (d) Compliance with
federal I-9 requirements (to the extent not already satisfied in connection with your employment with the Company). 
  
 This letter, is intended to outline the general terms of your employment with new Entegris and represents a contingent offer of employment with respect to the matters
covered by paragraphs 1 through 4 but reflects merely our current thinking concerning the matters discussed in paragraphs 5 and 6, which may be subject to adjustment as we proceed further with the integration planning prior to the Merger. Upon the
effectiveness of the Merger, this letter will be assumed by new Entegris. 
  
 To
indicate your acceptance of this contingent offer on the terms and conditions set forth in this letter, please sign and date this letter in the space provided below and return it promptly to the V.P. Human Resources for the Company. 
  

 155 

 We hope your employment with new Entegris will prove mutually rewarding, and we look forward to having you join us. If
you have any questions, please contact the VP of HR for the Company. 
  

	
	Very truly yours,
	
	MYKROLIS CORPORATION
	
	 /s/ Gideon Argov.

	Gideon Argov, Chief Executive Officer

  
 I have read this letter in its
entirety and agree to the terms and conditions of employment outlined herein. I understand and agree that this offer of employment is contingent on several factors identified in this letter and that, if I do become employed by new Entegris, my
employment will be at-will. 
  

			
	March 21, 2005	 	 /s/ Gerry Mackay.

	Date	 	Signature
	 	 	Gerry Mackay
	 	 	Printed Name

  

 156LETTER AGREEMENT, DATED MARCH 21, 205 W/ TAKASHI MIZUNO

 EXHIBIT 10.11 
  
 LETTER AGREEMENT, DATED MARCH 21, 2005 BETWEEN
MYKROLIS 
 CORPORATION AND TAKASHI MIZUNO 
  

 157 

 March 21, 2005 
  
 Mr. Takashi Mizuno 
 Mita Kokusai Bldg. 4.28

 1 Chome Mita Minato-Ku 
 Tokyo, Japan 108-0073 
  
 Dear Mizuno-san: 
  
 As you know, we have announced that there will be a merger of equals transaction (the “Merger”) between Mykrolis Corporation (the
“Company”) and Entegris, Inc.], with a new Delaware corporation to be called Entegris, Inc. (“new Entegris”) as the surviving corporation. This transaction has been approved by the Boards of Directors of both Mykrolis and
Entegris. While the conclusion of this Merger is still subject to stockholder and regulatory approvals, I want to act promptly to advise you of your role in the combined enterprise and the incentive compensation package that will be offered to you
upon the effectiveness of the Merger. We believe that the combination of Mykrolis and Entegris will create exciting, dynamic, growth oriented opportunities for the stockholders and employees of both companies. For this reason we have developed an
incentive compensation package for you designed to encourage you to work aggressively towards the successful integration of the two enterprises into a single world class company with performance that makes it a “must-own stock” for
investors. I hope the integration of the two businesses will be a smooth process and that you will become a major contributor to the success and growth of the combined enterprise and that in turn your experience as a member of the new Entegris team
will be personally rewarding and serve you well in the future. 
  
 The provisions
of this letter and your employment relationship with new Entegris will be subject to the contingencies set forth in paragraph 7 below. 
  
 1. Duties, Title and Salary. Your position, duties, and compensation in your employment with new Entegris
will be as follows: 
  

			
	Title:	  	Vice President and General Manager Fluid Business
		
	Duties:	  	General Management of the Fluid Business with full P&L responsibility
		
	Reporting Point:	  	Executive Vice President and Chief Operations Officer
		
	Base Salary:	  	¥23,258,340 annually, paid monthly.
		
	Incentive Plan:	  	You will be entitled to participate in the new Entegris management incentive plan at a level commensurate with your position and which will give appropriate recognition to your performance
for the Company prior to the Merger . The details of this plan and appropriate transition arrangements will be developed during the integration planning process prior to the effectiveness of the Merger.
		
	Equity Incentive:	  	Upon the effectiveness of the merger, new Entegris will award you 75,000 shares of restricted stock in new Entegris. The restrictions

  

 158 

			
	 	  	will lapse with respect to 37.5% of this award on December 31, 2005; an additional 5.21% on the last business day of each of the twelve fiscal quarters of new Entegris following the closing
of the Merger. Prior to the time that restrictions lapse, the restricted stock will be non-transferable and will be subject to the risk of forfeiture if your employment with new Entegris terminates. This award will be subject to the terms of the new
Entegris standard restricted stock award agreement.
		
	Project Bonus:	  	Upon successful and timely completion of integration milestones you will also be eligible to receive a one time bonus in the amount of 30% of your annual base salary, in accordance with the
Project Completion Bonus Incentive guidelines.
		
	Planning Bonus:	  	As part of the planning committee you will be eligible to receive a one time planning bonus in the amount of 30% of your pro rated annual base salary during the period from March 1, 2005
through the closing date of the Merger.

  
 During your employment by new
Entegris, you agree to devote your entire assigned working time to your duties at new Entegris and to comply with the new Entegris ethics code and with all company policies. Upon becoming a new Entegris employee, you will be given a new employee
document package containing employee forms and agreements, which you will be required to promptly complete, sign and return. 
  
 2. At-Will Employment, etc. While it is our sincere hope and belief that our relationship will be a long one, your employment
relationship with new Entegris will be “at-will.” This means your employment is not for any specific period of time and can be terminated by you or new Entegris at any time, with or without cause or advance notice. In addition, new
Entegris will reserve the right to modify your position or duties to meet business needs. Any change to the at-will employment relationship must be by a specific, written agreement signed by you and by new Entegris’s Senior Vice President of
Human Capital. 
  
 3. Prior Employer Service
Credit. For purposes of benefit eligibility, vesting, vacation and sick pay accruals for your employment with new Entegris, you will receive service credit based on your prior service with the Company.  
  
 4. Change of Control
Agreement. Upon the effectiveness of the Merger and as a condition to the equity incentive award described above, you will be required to enter into an executive change of control agreement with new Entegris in replacement
and cancellation of your current Amended and Restated Executive Termination Agreement with the Company. This agreement will generally provide for severance benefits and accelerated vesting of stock option and restricted stock awards in the event
that your employment with new Entegris is terminated during a period of two years following a change of control (including a change of control effected by the Merger). The severance benefit will generally be equal to two years base salary plus
variable compensation at the highest level during the three years prior to any change of control termination of employment. This agreement will also contain a two year non-competition clause. 
  

 159 

 5. Benefits. As a new Entegris employee, you will be
entitled to participate in all benefits that new Entegris currently provides its U.S. employees, subject to the eligibility requirements set forth in new Entegris’s benefit plans and/or policies. New Entegris will reserve the right to change or
eliminate the benefits it provides to all employees on a prospective basis at any time. Due to administrative complexities arising out of the post Merger integration of benefit systems, however, there may be certain benefits in which you will not be
immediately eligible to participate. To minimize any disruption, your existing benefits will be continued during this interim integration period. Upon becoming a new Entegris employee, you will be eligible for paid holidays pursuant to new
Entegris’s holiday schedule, which will be determined at the beginning of each calendar year. 
  
 6. 401(k) Savings & Investment Plan. It is expected that new Entegris will offer a 401(k) plan with provisions
substantially similar to those of the current 401(k) plan of the Company. It is also expected that you will be eligible to roll your distribution from the Company 401(k) plan into the new Entegris 401(k) plan in accordance with its provisions if you
wish to do so. Generally, we expect that new Entegris 401(k) plan will be a combined discretionary employer retirement contribution plan with a target contribution level determined in the discretion of the new Entegris Board of Directors and a
401(k) plan, which will generally provide for an employer match for employee contributions (currently at the rate of 50% of employee qualifying contributions up to 6% of compensation), however, specific provisions of the new Entegris plan will be
finalized in the coming weeks. 
  
 7.
Contingencies. This offer is contingent upon the following: 
  
 (a) Successful closing of the Merger; 
  
 (b) Your continued, active employment with the Company through the closing of the Merger; 
  
 (c) Signing a standard new Entegris Employee Agreement; and 
  
 (d) Compliance with federal I-9 requirements (to the extent not already satisfied in connection with your employment
with the Company). 
  
 This letter, is intended to outline the general terms of
your employment with new Entegris and represents a contingent offer of employment with respect to the matters covered by paragraphs 1 through 4 but reflects merely our current thinking concerning the matters discussed in paragraphs 5 and 6, which
may be subject to adjustment as we proceed further with the integration planning prior to the Merger. Upon the effectiveness of the Merger, this letter will be assumed by new Entegris. 
  
 To indicate your acceptance of this contingent offer on the terms and conditions set forth in this letter, please sign and date this letter
in the space provided below and return it promptly to the V.P. Human Resources for the Company. 
  

 160 

 We hope your employment with new Entegris will prove mutually rewarding, and we look forward to having you join us. If
you have any questions, please contact the VP of HR for the Company. 
  

	
	Very truly yours,
	
	MYKROLIS CORPORATION
	
	 /s/ Gideon Argov.

	Gideon Argov, Chief Executive Officer

  
 I have read this letter in its
entirety and agree to the terms and conditions of employment outlined herein. I understand and agree that this offer of employment is contingent on several factors identified in this letter and that, if I do become employed by new Entegris, my
employment will be at-will. 
  

			
	March 21, 2005	 	 /s/ Takashi Mizuno.

	Date	 	Signature
	 	 	Takashi Mizuno
	 	 	Printed Name

  

 161

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